"How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?"

"The most winning woman I ever knew was hanged for poisoning three little children for their insurance-money."

"How small we feel with our petty ambitions and strivings in the presence of the great elemental forces of Nature!"

"The greatest danger in life is to be too safe."

"The highest and most complex achievement of the human intellect is the power of generalization."