Scholastic learning and polemical divinity retarded the growth of all true knowledge.

To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

Where there is shouting, there is no true knowledge.

To know what you know and what you do not know, that is true knowledge.

True friendship can afford true knowledge. It does not depend on darkness and ignorance.

A true knowledge of ourselves is knowledge of our power.