The wilderness provides an environment for a child's inner life to develop because it requires him to be constantly aware of his surroundings.

The only way in which one human being can properly attempt to influence another is by encouraging him to think for himself, instead of endeavoring to instill ready-made opinions into his head.

When I ceased to accept the teaching of my youth, it was not so much a process of giving up beliefs, as of discovering that I had never really believed.

Walking is the natural recreation for a man who desires not absolutely to suppress his intellect but to turn it out to play for a season.

The division between faith and reason is a half-measure, till it is frankly admitted that faith has to do with fiction, and reason with fact.

Every man who says frankly and fully what he thinks is doing a public service.

I believe that the ascent of mountains forms an essential chapter in the complete duty of man, and that it is wrong to leave any district without setting foot on its highest peak.