"Divide each difficulty into as many parts as is feasible and necessary to resolve it."

"It is not enough to walk with great strides, it is necessary to walk in the right road."

"The long chains of simple and easy reasonings by means of which geometers are accustomed to reach the conclusions of their most difficult demonstrations, had led me to imagine that all things, the kno…"

"The existence of God is as evident as that of a triangle."

"I shall proceed by setting aside all that in which I can suppose there to be the slightest doubt, just as if I had discovered that it was wholly false."