Wisdom from Prophets

The best of friends is he who is best in behavior and character -Prophet Muhammad (PBUH)

Wisdom from Quran

It is He Who gives life and death, and to Him is due the alternation of Night and Day: will ye not then understand? (23:80)

Wisdom from Imams

You may be in need but remember that if you have need of someone, you still turn yourself into his slave. But if you do away with that need, you will be his equal and if you show benevolence to someone, you will be his master- Imam Ali (AS)