"I bought some books in order to learn the first principles of philosophy."

"I am undecided whether or not the Milky Way is but one of countless others all of which form an entire system. Perhaps the light from these infinitely distant galaxies is so faint that we cannot see them."

"I understood that the will could not be improved before the mind had been enlightened."

"The first object of my endeavours was the means to become perfect and happy."