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

This world is a prison for a momin and a paradise for the unbeliever- Imam Reza (AS)