All that we know of the life of man is merely a certain relation of free will to inevitability, that is, of consciousness to the laws of reason.
All that we know of the external world of nature is only a certain relation of the forces of nature to inevitability, or of the essence of life to the laws of reason.
The great natural forces lie outside us and we are not conscious of them
 Leo Tolstoy, War and Peace (1869). copy citation

add
Author Leo Tolstoy
Source War and Peace
Topic consciousness reason
Date 1869
Language English
Reference
Note Translated by Louise and Aylmer Maude
Weblink http://www.gutenberg.org/files/2600/2600-h/2600-h.htm

Context

“Only by uniting them do we get a clear conception of man’s life. Apart from these two concepts which in their union mutually define one another as form and content, no conception of life is possible. All that we know of the life of man is merely a certain relation of free will to inevitability, that is, of consciousness to the laws of reason. All that we know of the external world of nature is only a certain relation of the forces of nature to inevitability, or of the essence of life to the laws of reason. The great natural forces lie outside us and we are not conscious of them; we call those forces gravitation, inertia, electricity, animal force, and so on, but we are conscious of the force of life in man and we call that freedom. But just as the force of gravitation, incomprehensible in itself but felt by every man, is understood by us only to the extent to which we know the laws of inevitability to which it is subject” source