"Let us now consider, for a little while, how wonderfully we stand upon this world. Here it is we are born, bred, and live, and yet we view these things with an almost entire absence of wonder to ourse…"

"I can at any moment convert my time into money, but I do not require more of the latter than is sufficient for necessary purposes."

"The true scientist is a man who is always learning, and never assumes that he knows everything."

"I am content to be a humble laborer in the field of science."

"The secret of my success is due to my happy facility of being able to draw correct conclusions from imperfect data."