It is harder to crack prejudice than an atom.

The most important question a person can ask is, "Is the Universe a friendly place?

Never regard study as a duty, but as the enviable opportunity to learn

Men like Henry George [ the pioneer of land value taxation] are rare, unfortunately. One cannot imagine a more beautiful combination of intellectual keenness, artistic form, and fervent love of justice.

The more a man is imbued with the ordered regularity of all events the firmer becomes his conviction that there is no room left by the side of this ordered regularity for causes of a different nature. For him neither the rule of human nor the rule of divine will exist as an independent cause of natural events.

Classical thermodynamics ... is the only physical theory of universal content which I am convinced ... will never be overthrown.

Many of the things you can count, don't count. Many of the things you can't count, really count.