"The only way to do great work is to love what you do."

"The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them."

The present state of the system of nature is evidently a resultant of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.

"We are all our own graveyards I believe; we squat amongst the tombs of the people we were."

No president who performs his duties faithfully and conscientiously can have any leisure.