Justice is to be found only in imagination.

Contentment is the only real wealth.

If I have a thousand ideas and only one turns out to be good, I am satisfied.

Lawyers have to make a living, and can only do so by inducing people to believe that a straight line is crooked.

The first time I saw nitroglycerine was in the beginning of the Crimean War. Professor Zinin in St. Petersburg exhibited some to my father and me, and struck some on an anvil to show that only the part touched by the hammer exploded without spreading.

One can state, without exaggeration, that the observation of and the search for similarities and differences are the basis of all human knowledge.