I think; therefore I am.

“Good sense is of all things in the world the most equally distributed, for ever…”

“Il est bon de savoir quelque chose des moeurs de divers peuples, afin de juger …”

“It is not enough to have a good mind. The main thing is to use it well.”

“I am in doubt as to the propriety of making my first meditations in the place a…”