We call the one side [of humanity] religion, and we call the other science. Religion is always right. ... Science is always wrong; it is the very artifice of men. Science can never solve one problem without raising ten more problems.

You'll never have a quiet world till you knock the patriotism out of the human race.

Even if animal experimentation was proved to be of value, it would be morally wrong.

A broken heart is a very pleasant complaint for a man in London if he has a comfortable income.

Popular Christianity has for its emblem a gibbet, for its chief sensation a sanginary execution after torture, for its central mystery is an insane vengeance bought off by a trumpery expiation. But there is a nobler and profounder Christianity which affirms the sacred mystery of equality and forbids the glaring futility and folly of vengeance.

Nothing is ever done in this world until men are prepared to kill one another if it is not done.

Only on paper has humanity yet achieved glory, beauty, truth, knowledge, virtue, and abiding love.