The man who masters himself is delivered from the force that binds all creatures.

Should I not be proud, when for twenty years I have had to admit to myself that the great Newton and all the mathematicians and noble calculators along with him were involved in a decisive error with respect to the doctrine of color, and that I among millions was the only one who knew what was right in this great subject of nature?

Every need whose true satisfaction is denied leads by necessity to faith.

There are but few who have ideas and are, at the same time, capable of action. Ideas enlarge but stymie, action enlivens but confines.

If in the infinite you want to stride, Just walk in the finite to every side.

No wise combatant underestimates their antagonist.

Dispel not, the happy delusions of children.