There is a great deal of human nature in man.
Marriage is nature's way of keeping us from fighting with strangers.
The function of prayer is not to influence God, but rather to change the nature of the one who prays.
Horrifying as it was to crack up in the public eye, it made me look at myself and fix it. People were exploitative; that's human nature.
Support by United States rulers is rather in the nature of the support that the rope gives to a hanged man.
Falling down became second nature and it really didn't bother me.
Nature uses as little as possible of anything.
The diversity of the phenomena of nature is so great, and the treasures hidden in the heavens so rich, precisely in order that the human mind shall never be lacking in fresh nourishment.
If we do not voluntarily bring population growth under control in the next one or two decades, the nature will do it for us in the most brutal way, whether we like it or not.
A political convention is not a place where you can come away with any trace of faith in human nature.
It is not to be expected that human nature will change in a day.
Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing.
Man is by nature competitive, combative, ambitious, jealous, envious, and vengeful.
Good men, whether they be Christians or rationalists, do not desire to discriminate between races, but the distinctions implanted by Nature are too conspicuous to escape the observation of our senses.
Civilization never stands still; if in one country it is falling back, in another it is changing, evolving, becoming more complicated, bringing fresh experience to body and mind, breeding new desires, and exploiting Nature's cupboard for their satisfaction.