Imam Sadiq (AS) is the sixth Shiite Imam after his father Imam Baqir (AS). The Shiite school is mostly famous as “Jafari School” because Imam Sadiq (AS) played the most important role among the other Imams in explaining and spreading the Shiite teachings. Most of the Shiite hadiths are narrated from Imam Sadiq (AS). 

Enlightening people about the essential message of Islam

Some Islamic teachings and practices are considered as the outer aspect of Islam, like praying, Hajj, Zakkat and stuff like that. These are the practices which any Muslim should do and respect but all of them have a deeper meaning and a concealed message that people mostly do not get. Sometimes people get so much used to do these practices and conduct ceremonies that they forget about the original meaning of them. 
The holy Prophet (PBUH & HP) says: 
O Aba-Zar! (One of the companions of the Prophet) Allah almighty doesn’t care about your faces or your wealth, but he cares about your hearts and your actions (1)
When you pray or pay your Zakkat, it must change you and teach you that praying is for getting closer to Allah and Zakkat is for helping the needy. 
In this regard the holy Quran says:
Did you see him who denies the Religion?  That is the one, who drives away the orphan, and does not urge the feeding of the needy.  Woe to those who pray but are heedless of their prayers —who show off but deny aid. (The Holy Quran 107:1-7)
Imam Sadiq (AS) in different prayers says that if you pray but still feel pride and vanity, it will be useless for you because the Satan himself prayed for Allah for 6000 years but due to his vanity and jealousy, he couldn’t stand the greatness of Adam and tried to deceive him and Allah cursed the Satan. 

Being Kind with the ones who disagree 

Once Mufazzal ibn Umar (One of the brilliant pupils of the Imam) was sitting in the Mosque of the Prophet (PBUH & HP) in Medina. Then he saw Ibn Abi al-Ouja (one of the Atheist Philosophers) who was insulting the Prophet in the mosque and telling lies to the people saying that there is no god. 
Mufazzal says that this made him so angry and he couldn’t control himself so he shouted: “O enemy of Allah! Have you become atheist and denied the God who created you?”
Ibn Abi al-Ouja replied: “If you are one of the religious scholars, I will have debate with you and if you are not, our discussion will be in vain. But if you are one of the companions of Jafar ibn Muhammad (Imam Sadiq) you must know that he wouldn’t talk to us like that and he wouldn’t have discussion with us in this way. He has heard so many more disgraceful words from us but he never has insulted us. He is so knowledgeable, patient and wise and he wouldn’t lose his control out of anger, ignorance or animosity. He always listens to us.” (2)
Imam Sadiq (AS) is famous for his numerous debates with the Sunnis, Atheists, Jews, Christians and so forth, but he would never insult them. He always would order his followers to be kind with the people. 
For example about the Sunnis Imam Sadiq (AS) says:
Participate in their funerals and visit them when they are sick, and give them their rights because if a person among you is pious, honest, trustable and good-tempered, people would say “this is a follower of Jafar” and this makes me happy! (3)

Imam Sadiq (AS) and Caring about the young people

Once Imam Sadiq (AS) asked one of his pupils who had gone to Basrah (a city in Iraq):
“How was the enthusiasm of the people for our message and converting to Shia?” Imam Sadiq (AS) asked.
He said: “The ones who want to listen to our message are so few. Some of them did but they are few”
Imam Sadiq (AS) said: “You must talk to the young ones, because they are more eager for finding everything good.” (4)
Imam Sadiq (AS) also says:
“Teach hadiths to your young children from their childhood before the time that others beat you in training them” (5)
Young Shias must set Imam Sadiq (AS) as a pattern for themselves and follow him. They should learn more and more so that the different people who have gone astray can’t deceive them. 

Resources 

1.  Al-Amali, Sheikh Toosi, Pg.536
2.  Tohid al-Mufazzal
3.  Kafi, Koleini, vol.2, pg.636
4.  Vasail ash-Shia, vol.11, pg.448
5.  Kafi, Koleini, vol.6, pg.47

Whatever we look at or even see, enters our mind and soul, and sticks to them. Imam Ali (AS) said: “The eye is the reporter of heart and the messenger of mind.” [1]. It means that every act of looking profoundly affects our heart and soul. The prophet (PBUH&HP) said: “Avoid unnecessary excess looks as they grow lust in your hearts and make you heedless.” [2].

In another saying from Imam Ali (AS), we read that: “The eyes are the snares of Satan” [3]. That is why Islam has special guidelines and rules about at what or whom, one is allowed or not to look. And, this is more pressing in case of Muslims living in a non-Muslim society, where they are constantly exposed to both men and women freely and improperly dressed in the streets, TV, magazines, web pages, etc. Islam has regulated looking at the opposite gender according to the two categories: Mahrams and non-Mahrams [4].

Men Looking at Mahram Women 

A man is permitted to look at the body of a woman who is his Mahram, except her private parts (Awrah). And he must not look at her body from the navel down to the knee. This means that a woman should dress decently even in the presence of her Mahrams. One’s wife is an exception to this rule; married couples are allowed to look at the entire body of each other.

Men Looking at non-Mahram Women

It is forbidden for a man to look at the body of any non-Mahram woman but he can look at her hands and face as long as they do not have any decoration. If the woman is Muslim, then he is not allowed to look at her hair. But if she is not Muslim, looking at her hair is not forbidden as long as it is not for pleasure.

Generally, there is no sin on a man for the first involuntary look at any non-Mahram woman, but the second look should be avoided [5]. In any case, men should remember that: “Tell the faithful men to cast down their looks and to guard their private parts. That is more decent for them.” (24:30).

This rule also extends to adolescent boys and even younger ones, who understand women’s physical attributes and might be attracted to them. They should be taught to lower their gaze, too. Since children’s minds and souls are clear lands ready to be cultivated with several types of thoughts and ideas mostly captured by eyes, we need to teach them which seeds they should plant in their lands to attain Allah’s eternal satisfaction.

Men Looking at Other Men and Women Looking at Other Women

A man is not allowed to look at another man’s private parts, nor a woman at those of another woman; whether Muslim or not. Besides, looking at any parts of the body of another man, even the face and arms, will be forbidden for a man if done with the intention of having pleasure. The same ruling applies to a woman towards another woman. This also means that one should always cover his/her private parts in the presence of others, even of the same gender.

Women Looking at Mahram Men

A woman is allowed to look at the body of a man who is her Mahram, except his private parts, if it is not for having pleasure. One’s husband is an exception to this rule as mentioned earlier. 

Women Looking at non-Mahram Men

A woman is not permitted to look at the body of a non-Mahram man, except for the face, hands, and that amount which men usually [i] do not cover and if it is not for pleasure.

Looking at a Small Child's Private Parts

One is permitted to look at the entire body of a child until he/she reaches the age when the child’s consciousness of sex has developed, or when evidence of sexual urge is noticed on him/her; even if it is before reaching puberty. However, it is better to accustom the child to always dress properly.

As a general rule, it is forbidden (Haram) to look at anyone (even at one’s own body) or anything (including people’s photos and films, statues, etc.) with the intention of having pleasure (with the exception of one’s spouse), even if one is looking at a Mahram.

In cases of “necessity” such as in administering first aid, medical treatment [ii] or during a trial testimony where the judge requests the witness to look at a non-Mahram to identify him/her [6], all the rules of the prohibition of looking become void. As an instance, if a doctor is compelled to look at a part of the body of a non-Mahram woman, he must only look at that part necessary for the treatment, but not more than that. Also, if possible, the examination or testing must be performed over the clothing. Other exceptions are looking at one’s spouse as explained above.

Notes:

[i] This, although following a definite limit indicated in Islamic ruling that should be respected, is based on the normal condition of each society to some extent.

[ii] In the case that a doctor of the same skill and with the same gender is not available.

References:

1. M. B. Majlesi, “Bihar al-Anwar”, vol. 104, p. 41, T. 52.
2. M. B. Majlesi, “Bihar al-Anwar”, vol. 72, p. 199.
3. M. B. Majlesi, “Bihar al-Anwar”, vol. 77, p. 294.
4. www.al-islam.org
5. Ibn Babawayh, “Man la yahduruhu al-Faqih”, vol.3, p.474, T. 4658.
6. looking to others