Who said "To know oneself is the beginning of true leadership."?

This quote is attributed to Suetonius.

To know oneself is the beginning of true leadership. - Suetonius

"To know oneself is the beginning of true leadership."

Suetonius

Historian Biographer Ancient Rome 69–122

"Life is not a spectacle or a feast; it is a predicament."

"The greatest power is often simple patience."

"Men willingly believe what they wish."

"Nothing is so unbelievable that the orators of Rome cannot turn it to their advantage."