I say that a man must be certain of his morality for the simple reason that he has to suffer for it.

Surely we cannot take an open question like the supernatural and shut it with a bang, turning the key of the madhouse on all the mystics of history. You cannot take the region of the unknown and calmly say that, though you know nothing about it, you know all the gates are locked. We do not know enough about the unknown to know that it is unknowable.

If seeds in the black earth can turn into such beautiful roses, what might not the heart of man become in its long journey toward the stars?

They say travel broadens the mind, but you must have the mind.

People who make history know nothing about history. You can see that in the sort of history they make.

No sceptical philosopher can ask any questions that may not equally be asked by a tired child on a hot afternoon.

Dipsomaniac and the abstainer are not only both mistaken, but they both make the same mistake. They both regard wine as a drug and not as a drink.