Such is always the pursuit of knowledge. The celestial fruits, the golden apples of the Hesperides, are ever guarded by a hundred-headed dragon which never sleeps, so that it is an Herculean labor to pluck them.

Never look back unless you are planning to go that way.

The authority of government . . . can have no pure right over my person and property but what I concede to it.

In the production of the necessaries of life Nature is ready enough to assist man.

There are sure to be two prescriptions diametrically opposite.

In the wildest nature, there is not only the material of the most cultivated life, and a sort of anticipation of the last result,but a greater refinement already than is ever attained by man.... Nature is prepared to welcome into her scenery the finest work of human art, for she is herself an art so cunning that the artist never appears in his work.

It is not enough to be busy. So are the ants. The question is: What are we busy about?