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?

However often we turn to it [the Koran] at first disgusting us each time afresh, it soon attracts, astounds, and in the end enforces our reverence. . . . Its style, in accordance with its contents and aim is stern, grand, terrible - ever and anon truly sublime - Thus this book will go on exercising through all ages a most potent influence.

Sound and sufficient reason falls, after all, to the share of but few men, and those few men exert their influence in silence.

What is the path? There is no path. On into the unknown.

One needs only to get old to become milder; I don't see anyone make a mistake I hadn't also made.

Ah! my poor brain is racked and crazed, My spirit and senses amazed!

To make something you have to be something.