Commerce is the great civilizer. We exchange ideas when we exchange fabrics.

By physical liberty I mean the right to do anything which does not interfere with the happiness of another. By intellectual liberty I mean the right to think and the right to think wrong.

In making up my mind as to what Mr. Lincoln really believed, I do not take into consideration the evidence of unnamed persons or the contents of anonymous letters; I take the testimony of those who knew and loved him, of those to whom he opened his heart and to whom he spoke in the freedom of perfect confidence.

The few took advantage of the ignorant many. They pretended to have received messages from the Unknown. They stood between the helpless multitude and the gods. They were the carriers of flags of truce. At the court of heaven they presented the cause of man, and upon the labor of the deceived they lived.

We do not need the forgiveness of God, but of each other and of ourselves.

I will follow my logic, no matter where it goes, after it has consulted with my heart. If you ever come to a conclusion without calling the heart in, you will come to a bad conclusion.

Let us account for all we see by the facts we know. If there are things for which we cannot account, let us wait for light. To account for anything by supernatural agencies is, in fact to say that we do not know. Theology is not what we know about God, but what we do not know about Nature.