All truth, in the long run, is only common sense clarified.
The results of political changes are hardly ever those which their friends hope or their foes fear.
Try to learn something about everything and everything about something.
It is one of the most saddening things in life that, try as we may, we can never be certain of making people happy, whereas we can almost always be certain of making them unhappy.
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.
The more rapidly truth is spread among mankind the better it will be for them. Only let us be sure that it is the truth.
The great thing in the world is not so much to seek happiness as to earn peace and self-respect.
The improver of natural knowledge absolutely refuses to acknowledge authority, as such. For him, skepticism is the highest of duties; blind faith the one unpardonable sin.
The child who has been taught to make an accurate elevation, plan, and section of a pint pot has had an admirable training in accuracy of eye and hand.