To quarrel with the uncertainty that besets us in intellectual affairs would be about as reasonable as to object to live one's life with due thought for the morrow because no man can be sure he will alive an hour hence.

It is the first duty of a hypothesis to be intelligible.

The great thing in the world is not so much to seek happiness as to earn peace and self-respect.

The known is finite, the unknown infinite; intellectually we stand on an islet in the midst of an illimitable ocean of inexplicability. Our business in every generation is to reclaim a little more land, to add something to the extent and the solidity of our possessions.

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.

Mathematics may be compared to a mill of exquisite workmanship, which grinds your stuff to any degree of fineness.

Learn what is true in order to do what is right.