I think periods of browsing during which no occupation is imposed from without are important in youth because they give time for the formation of these apparently fugitive but really vital impressions.

Berkeley retains the merit of having shown that the existence of matter is capable of being denied without absurdity.

I suppose the advocates of unreason think that there is a better chance of profitably deceiving the populace if they keep it in a state of effervescence.

I say quite deliberately that the Christian religion, as organized in its Churches, has been and still is the principal enemy of moral progress in the world.

Science can teach us, and I think our hearts can teach us, no longer to look around for imaginary supporters, no longer to invent allies in the sky, but rather to look to our own efforts here below to make the world a fit place to live.

The desire for legitimate offspring is, in fact, according to the Catholic Church, the only motive which can justify sexual intercourse.

My conclusion is that there is no reason to believe any of the dogmas of traditional theology and, further, that there is no reason to wish that they were true. Man, in so far as he is not subject to natural forces, is free to work out his own destiny. The responsibility is his, and so is the opportunity.