"I have everything, yet have nothing; and although I possess nothing, still of nothing am I in want."

"There is a demand in these days for men who can make wrong appear right."

"There is nothing so easy but that it becomes difficult when you do it reluctantly."

"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 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."

"In all affairs it's a healthy thing now and then to hang a question mark on the things you have long taken for granted."

"The most erroneous stories are those we think we know best - and therefore never scrutinize or question."