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.

Science commits suicide when it adopts a creed.

The man of science has learned to believe in justification, not by faith, but by verification.

The scientific spirit is of more value than its products, and irrationally held truths may be more harmful than reasoned errors.

Time, whose tooth gnaws away everything else, is powerless against truth.

I take it that the good of mankind means the attainment, by every man, of all the happiness which he can enjoy without diminishing the happiness of his fellow men.

It is not who is right, but what is right, that is of importance.