The heroes and discoverers have found true more than was previously believed, only when they were expecting and dreaming of something more than their contemporaries dreamed of, or even themselves discovered, that is, when they were in a frame of mind fitted to behold the truth. Referred to the world's standard, they are always insane. Even savages have indirectly surmised as much.

Let us not play at kittly-benders. There is a solid bottom everywhere.

Let us not underrate the value of a fact; it will one day flower in a truth. It is astonishing how few facts of importance are added in a century to the natural history of any animal. The natural history of man himself is still being gradually written.

We communicate like the burrows of foxes, in silence and darkness, under ground. We are undermined by faith and love.

I did not wish to live what was not life, living is so dear; nor did I wish to practice resignation, unless it was quite necessary.

Deep are the foundations of sincerity. Even stone walls have their foundation below the frost.

I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach, and not, when I came to die, discover that I had not lived. I did not wish to live what was not life, living is so dear; nor did I wish to practise resignation, unless it was quite necessary. I wanted to live deep and suck out all the marrow of life, to live so sturdily and Spartan-like as to put to rout all that was not life, to cut a broad swath and shave close, to drive life into a corner, and reduce it to its lowest terms.