In agreement to return discovered objects based on presentation of identification: Bava Metzia 27b
Personal financial loss precedes that of others: Bava Metzia 30a-b, 33a
If one practices strictly according to the Above line, he will become poor and need others: Bava Metzia 33a
One who doesn't learn the Written and Oral Torah, and isn't involved in the Society of Others, isn't contributing to Civilization: Kiddushin 40b
Behavior which displeases the sages - ein ruach chachamim nochah heimenu