Now it is human nature to want to eat to ones fill when hungry, to want to warm up when cold, to want to rest when tired. These all are a part of people's emotional nature.

I am more and more convinced that our happiness or our unhappiness depends far more on the way we meet the events of life than on the nature of those events themselves.

Go forth under the open sky, and list To Nature's teachings.

Human nature is such that monogamy is a really hard thing to achieve.

Whatsoever is contrary to nature is contrary to reason, and whatsoever is contrary to reason is absurd.