You can alter your life by altering the state of your mind.

Our theories are wedged and controlled as nothing else is. Yet sometimes alternative theoretic formulas are equally compatible with all the truths we know, and then we choose between them for subjective reasons. We choose the kind of theory to which we are already partial: we follow 'elegenace' or 'economy'

The entire routine of our memorized acquisitions, for example, is a consequence of nothing but the Law of Contiguity. The words of a poem, the formulas of trigonometry, the facts of history, the properties of material things, are all known to us as definite systems or groups of objects which cohere in an order fixed by innumerable iterations, and of which any one part reminds us of the others.

If you believe that feeling bad or worrying long enough will change a past or future event, then you are residing on another planet with a different reality system.

(Five) thinkers since Galileo, each informing his successor of what discoveries his own lifetime had seen achieved, might have passed the torch of science into our hands as we sit here in this room. Indeed, for the matter of that, an audience much smaller than the present one, an audience of some 5 or 6 score people, if each person in it could speak for his own generation, would carry us away to the black unknown of the human species, to days without a document or monument to tell their tale.

[Religion is] the attempt to be in harmony with an unseen order of things.

The war for our Union, with all the constitutional issues which it settled, and all the military lessons which it gathered in, has throughout its dilatory length but one meaning in the eyes of history. It freed the country from the social plague which until then had made political development impossible in the United States. More and more, as the years pass, does the meaning stand forth as the sole meaning.