When it's time to die, let us not discover that we have never lived.

Leave no stone unturned, yet disturb no stone.

Not in the clamor of the crowded street, Not in the shouts and pludits of the throng, But in ourselves, are triumph and defeat.

I believe that no discovery of fact, however trivial, can be wholly useless to the race, and that no trumpeting of falsehood, however virtuous in intent, can be anything but vicious

Explore your higher latitudes . . . be a Columbus to whole new continents and worlds within you, open new channels, not of trade but of thought.

We do not enjoy poetry unless we know it to be poetry.