America is a young country with an old mentality.

In endowing us with memory, nature has revealed to us a truth utterly unimaginable to the unreflective creation, the truth of immortality....The most ideal human passion is love, which is also the most absolute and animal and one of the most ephemeral.

Spirituality lies in regarding existence merely as a vehicle for contemplation, and contemplation merely a vehicle for joy.

Happiness is impossible, and even inconceivable, to a mind without scope and without pause, a mind driven by craving, pleasure, or fear. To be happy, you must be reasonable, or you must be tamed. You must have taken the measure of your powers, tasted the fruits of your passion, and learned your place in the world and what things in it can really serve you. To be happy, you must be wise.

...science is nothing but developed perception, interpreted intent, common-sense rounded out and minutely articulated. It is therefore as much an instinctive product, as much a stepping forth of human courage in the dark, as is any inevitable dream or impulsive action.

Those who cannot remember the past are condemned to repeat it.

The strongest feelings assigned to the conscience are not moral feelings at all; they express merely physical antipathies.