Everything has a natural explanation. The moon is not a god, but a great rock, and the sun a hot rock.

“It is natural and harmless in English to use a preposition to end a sentence with.”

“I was born trash in a land where the people all believe themselves natural aristocrats.”

Beauty is a manifestation of secret natural laws, which otherwise would have been hidden from us forever.

Our culture mocks "primitive cultures" and prides itself on suppression of natural instincts and impulses.

We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances.

The domestic career is no more natural to all women than the military career is natural to all men.

I am convinced that natural selection has been the main but not exclusive means of modification

Practice makes perfect. After a long time of practising, our work will become natural, skill full, swift, and steady.