Avos 2:9

He [Rabban Yohanan] said unto them: go forth and observe which is the right way to which a man should cleave? Rabbi Eliezer said, a good eye; Rabbi Joshua said, a good companion; Rabbi Yose said, a good neighbor; Rabbi Shimon said, foresight. Rabbi Elazar said, a good heart. He [Rabban Yohanan] said to them: I prefer the words of Elazar ben Arach, for in his words your words are included. He [Rabban Yohanan] said unto them: go forth and observe which is the evil way which a man should shun? Rabbi Eliezer said, an evil eye; Rabbi Joshua said, an evil companion; Rabbi Yose said, an evil neighbor; Rabbi Shimon said, one who borrows and does not repay for he that borrows from man is as one who borrows from God, blessed be He, as it is said, “the wicked borrow and do not repay, but the righteous deal graciously and give” (Psalms 37:21). Rabbi Elazar said, an evil heart. He [Rabban Yohanan] said to them: I prefer the words of Elazar ben Arach, for in his words your words are included.

"A good eye": One who suffices with what he has and does not seek extraneous things - and is not envious when he sees that his fellow has more than him.

"A good friend": who rebukes him when he sees him doing something that is improper.

Rabbi Yosi says: A good neighbor: That he himself be a good neighbor to all of his neighbors. And once he becomes good and a loyal friend to five or eight people, the matter is close for him to love all that come to the world. And [so] he is happy and with all of the good traits.

"A good neighbor": who is found near him, whether by day or by night; whereas a good friend is not found near him all the time.

"Seeing the consequences of one's actions": One who looks out and sees what will be in the future. And through this, he calculates the loss [engendered by doing] a commandment versus its reward and the reward [engendered by doing] a sin versus its loss.

He said to them: I see the words of Rabbi Elazar ben Arakh [as better than] all of yours, because your words are included in his: As a man that has a trait like this dwell within him is also good to his friends and to his neighbors and to the whole world. He also has the trait of generosity; as he is generous to people with his body and heart, to wish what they desire and to do their will - all the more so will he be generous to them with his money. And every good trait will reside in a person like this - as the will of a healthy heart is a greater thing than the act. As behold, the commandments are the action of the limbs [and] are only labor, and easy to do. But that he should place his eyes and his heart there all the days to think of thoughts to do the labor of God from great devotion and love [of God] for his Name, may He be blessed - that is the [true effort] from this thing.