To know that we know what we know and that we do not know what we do not know that is true knowledge.

As for style of writing if one has anything to say it drops from him simply and directly as a stone falls to the ground.

Thus the great civilizer sends out its emissaries, sooner or later, to every sandy cape and light-house of the New World which the census-taker visits, and summons the savage there to surrender.

Pursue some path, however narrow and crooked, in which you can walk with love and reverence.

Perhaps these pages are more particularly addressed to poor students. As for the rest of my readers, they will accept such portions as apply to them. I trust that none will stretch the seams in putting on the coat, for it may do good service to him whom it fits.

How vain it is to sit down to write when you have not stood up to live.