Being deeply loved by someone gives you strength, while loving someone deeply gives you courage.

"Being deeply loved by someone gives you strength, while loving someone deeply gives you courage."
-- Lao Tzu

He who controls others may be powerful, but he who has mastered himself is mightier still

“He who controls others may be powerful, but he who has mastered himself is mightier still.”
~ Lao Tzu

Lao Tzu was a philosopher of ancient China and is a central figure in Taoism (also spelled "Daoism"). Laozi literally means "Old Master" and is generally considered an honorific. Laozi is revered as a deity in most religious forms of Taoism. Taishang Laojun is a title for Laozi in the Taoist religion, which refers to him as "One of the Three Pure... See More Ones".

According to Chinese tradition, Laozi lived in the 6th century BC. Historians variously contend that Laozi is a synthesis of multiple historical figures, that he is a mythical figure, or that he actually lived in the 4th century BC, concurrent with the Hundred Schools of Thought and Warring States Period.