"We must trust to nothing but facts: these are presented to us by nature and cannot deceive."

"The value of a discovery consists not in its novelty, but in its truth."

"The universe is a machine, and we are its engineers."

"Imagination, on the contrary, which is ever wandering beyond the bounds of truth, joined to self-love and that self-confidence we are so apt to indulge, prompt us to draw conclusions which are not imm…"

"It took them only an instant to cut off that head, but France may not produce another like it in a century."