To know oneself is to possess the key to all doors. - Giambattista della Porta

"To know oneself is to possess the key to all doors."

Giambattista della Porta

Dramatist Scientist Polymath Italian 1535–1615

More from Giambattista della Porta

"Nature is the art of God."

"Knowledge is power, but enthusiasm pulls the switch."

"The greatest power is the power of imagination."

"Life is a stage, and we are merely players upon it."