"The soul desires to dwell with the body, because without the corporeal instruments, it can neither act nor feel."

"Study without desire spoils the memory, and it retains nothing that it takes in."

"The greatest deception men suffer is from their own opinions."

"Nothing strengthens authority so much as silence."

"He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast."