The ultimate court of appeal is observation and experiment... not authority.

What men of science want is only a fair day's wages for more than a fair day's work.

Better live a crossing-sweeper than die and be made to talk twaddle by a "medium" hired at a guinea a seance.

The supernatural is being swept out of the universe in the flood of new knowledge of what is natural. It will soon be as impossible for an intelligent, educated man or woman to believe in a god as it is now to believe that earth is flat, that flies can be spontaneously generated, that disease is a divine punishment, or that death is always due to witchcraft.

The saying that a little knowledge is a dangerous thing is, to my mind, a very dangerous adage. If knowledge is real and genuine, I do not believe that it is other than a very valuable posession, however infinitesimal its quantity may be. Indeed, if a little knowledge is dangerous, where is a man who has so much as to be out of danger?

Rome is the one great spiritual organisation which is able to resist and must, as a matter of life and death, the progress of science and modern civilization

Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.