Congress shall make no law abridging the freedom of production and trade.

Live and act within the limit of your knowledge and keep expanding it to the limit of your life. Redeem your mind from the hockshops of authority. Accept the fact that you are not omniscient, but playing a zombie will not give you omniscience-that your mind is fallible, but becoming mindless will not make you infallible-that an error made on your own is safer than ten truths accepted on faith, because the first leaves you the means to correct it, but the second destroys your capacity to distinguish truth from error.

I started my life with a single absolute: that the world was mine to shape in the image of my highest values and never to be given up to a lesser standard, no matter how long or hard the struggle.

Achieving life is not the equivalent of avoiding death.

Do not let your fire go out.

The uncontested absurdities of today are the accepted slogans of tomorrow. They come to be accepted by degrees, by dint of constant pressure on one side and constant retreat on the other - until one day when they are suddenly declared to be the country's official ideology.

you are never called upon to prove a negative. that's a law of logic.