Nothing is to wonderful to be true.

Speculations? I have none. I am resting on certainties.

It is right that we should stand by and act on our principles; but not right to hold them in obstinate blindness, or retain them when proved to be erroneous.

ou can hardly imagine how I am struggling to exert my poetical ideas just now for the discovery of analogies and remote figures respecting the earth, sun, and all sorts of things — for I think that is the true way (corrected by judgment) to work out a discovery.

Now I must take you to a very interesting part of our subject-to the relation between the combustion of a candle and that living kind of combustion which goes on within us. In every one of us there is a living process of combustion going on very similar to that of a candle, and I must try to make that plain to you. For it is not merely true in a poetical sense-the relation of the life of man to a taper; and if you will follow, I think I can make this clear.

I am no poet, but if you think for yourselves, as I proceed, the facts will form a poem in your minds.

Work, finish, publish.