I shall now confess to you that none of those three trout had to be beheaded, or folded double, to fit their casket. What was big was not the trout, but the chance. What was full was not my creel, but my memory.

Patriotism requires less and less of making the eagle scream, but more and more of making him think.

I confess my own leisure to be spent entirely in search of adventure, without regard to prudence, profit, self improvement, learning, or any other serious thing.

Teach the student to see the land, understand what he sees, and enjoy what he understands.

One of the penalties of an ecological education is that one lives alone in a world of wounds.

To keep every cog and wheel is the first precaution of intelligent tinkering.

All ethics so far evolved rest upon a single premise: that the individual is a member of a community of interdependent parts.