Logical consequences are the scarecrows of fools and the beacons of wise men.

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

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

I protest that if some great Power would agree to make me always think what is true and do what is right, on condition of being turned into a sort of clock and would up every morning before I got out of bed, I should instantly close with the offer.

Mix salt and sand, and it shall puzzle the wisest of men, with his mere natural appliances, to separate all the grains of sand from all the grains of salt; but a shower of rain will effect the same object in ten minutes.

Of moral purpose I see no trace in Nature. That is an article of exclusively human manufacture and very much to our credit.

Extinguished theologians lie about the cradle of every science, as strangled snakes beside that of Hercules