Wisdom from Prophets

Whoever suppresses his anger, when he has in his power to show it, God will give him a great reward -Prophet Muhammad (PBUH)

Wisdom from Quran

It is He Who has created you from dust then from a sperm-drop, then from a leech-like clot; then does he get you out as a child: then lets you reach your age of full strength; then lets you become old,- though of you there are some who die before;- and lets you reach a Term appointed; in order that ye may learn wisdom (40:67

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)