The human mind will not be confined to any limits.

Man is not born to solve the problem of the universe, but to find out what he has to do; and to restrain himself within the limits of his comprehension.

The credit of advancing science has always been due to individuals and never to the age.

In happy ignorance, I sighed for a world I did not know, where I hoped to find every pleasure and enjoyment which my heart could desire; and now, on my return from that wide world... how many disappointed hopes and unsuccessful plans have I brought back!

There is strong shadow where there is much light.

It is related of an Englishman that he hanged himself to avoid the daily task of dressing and undressing.

The spirit from which we act is the principal matter.