Toleration is the greatest gift of the mind; it requires the same effort of the brain that it takes to balance oneself on a bicycle.

In times of danger large groups rise to the highest pitch of enthusiasm, courage and sacrifice . . . Mankind will be refashioned and history rewritten when this law is understood and obeyed.

We differ, blind and seeing, one from another, not in our senses, but in the use we make of them, in the imagination and courage with which we seek wisdom beyond all senses.

I have often been asked, Do not people bore you? I do not understand quite what that means. I suppose the calls of the stupid and curious, especially of newspaper reporters, are always inopportune. I also dislike people who try to talk down to my understanding. They are like people who when walking with you try to shorten their steps to suit yours; the hypocrisy in both cases is equally exasperating.

The infinite wonders of the universe are revealed to us in exact measure as we are capable of receiving them. The keenness of our vision depends not on how much we can see, but on how much we feel.

A man can't make a place for himself in the sun if he keeps taking refuge under the family tree.

Be of good cheer. Do not think of today's failures, but of the success that may come tomorrow. You have set yourselves a difficult task, but you will succeed if you persevere, and you will find a joy in overcoming obstacles... Remember, no effort that we make to attain something beautiful is ever lost.