I think we're going to the moon because it's in the nature of the human being to face challenges. It's by the nature of his deep inner soul... we're required to do these things just as salmon swim upstream.

It's our nature: Human beings like success but they hate successful people.

Human nature is not of itself vicious.

In the general course of human nature A power over a man's subsistence amounts to a power over his will.

Where is human nature so weak as in the bookstore?

Human subtlety will never devise an invention more beautiful more simple or more direct than does nature because in her inventions nothing is lacking and nothing is superfluous.

The sway of alcohol over mankind is unquestionably due to its power to stimulate the mystical faculties of human nature usually crushed to earth by the cold facts and dry criticisms of the sober hour.

We must lay hold of the fact that economic laws are not made by nature. They are made by human beings.

To feel much for others and little for ourselves to restrain our selfishness and exercise our benevolent affections constitute the perfection of human nature.

There is a certain enthusiasm in liberty that makes human nature rise above itself in acts of bravery and heroism.