How we shall earn our bread is a grave question; yet it is a sweet and inviting question. Let us not shirk it, as is usually done.It is the most important and practical question which is put to man. Let us not answer it hastily. Let us not be content to get our bread in some gross, careless, and hasty manner. Some men go a-hunting, some a-fishing, some a-gaming, some to war; but none have so pleasant a time as they who in earnest seek to earn their bread.

I think it would be worth the while to introduce a school of children to such [an oak grove], that they may get an idea of the primitive oaks before they are all gone, instead of hiring botanists to lecture to them when it is too late.

You must love the crust of the earth on which you dwell more than the sweet crust of any bread or cake. You must be able to extract nutriment out of a sand-heap. You must have so good an appetite as this, else you will live in vain

He who hears the rippling of rivers in these degenerate days will not utterly despair.

The only obligation which I have a right to assume is to do at any time what I think right.

My enemies are worms, cool days, and most of all woodchucks.

All the moral laws are readily translated into natural philosophy, for often we have only to restore the primitive meaning of thewords by which they are expressed, or to attend to their literal instead of their metaphorical sense. They are already supernatural philosophy.