To a clear eye the smallest fact is a window through which the infinite may be seen.

The great end of life is not knowledge but action.

Natural knowledge, seeking to satisfy natural wants, has found the ideas which can alone still spiritual cravings. I say that natural knowledge, in desiring to ascertain the laws of comfort, has been driven to discover those of conduct, and to lay the foundations of a new morality.

In matters of intellect, follow your reason as far as it will take you, without regard for any other consideration.

Sit down before fact as a little child, be prepared to give up every conceived notion, follow humbly wherever and whatever abysses nature leads, or you will learn nothing.

And when you cannot prove that people are wrong, but only that they are absurd, the best course is to let them alone.

In fact a favourite problem of Tyndall is-Given the molecular forces in a mutton chop, deduce Hamlet or Faust therefrom. He is confident that the Physics of the Future will solve this easily.