The ground that a good man treads is hallowed.

The rose is wont with pride to swell, and ever seeks to rise.

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?

If you live criticizing people, you won't have time to love them.

The most difficult thing is what is thought to be the simplest; to really see the things which are before your eyes.

We gladly put antiquity above our age but not posterity. Only a father doesn't begrudge his son's talent.

If you want a wise answer, ask a reasonable question.