"Charity begins at home."

"That is true wisdom, to know how to alter one's mind when occasion demands it."

"Their silence is sufficient praise."

"What is done let us leave alone."

"Moderation in all things."

"I am a man, and whatever concerns humanity is of interest to me."

"Judge of a man by his questions rather than by his answers."

"A wise man's question contains half the answer."

"If you ask too many questions, you will find no answers, only more questions."

"A thinker sees his own actions as experiments and questions--as attempts to find out something. Success and failure are for him answers above all."

"The outcome of any serious research can only be to make two questions grow where only one grew before."

"Ask questions from your heart and you will be answered from the heart."