"I have always taken the greatest pleasure in mathematics."

"The greatest good is the knowledge of truth."

"It is not enough to apply our mind to things, but we must also apply it to ourselves."

"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, to the …"

"I should know better than to believe that everything I perceive through my senses is true."