a man does not cry because he is sad, he is sad because he cries

There must always be a discrepncy between concepts and reality, because the former are static and discontinuous while the latter is dynamic and flowing

Belief creates the actual fact.

In the matter of belief, we are all extreme conservatives.

Every man who possibly can should force himself to a holiday of a full month in a year, whether he feels like taking it or not.

To consider hypotheses is surely always better than to dogmatize ins blaue hinein

The first effect of the mind growing cultivated is that processes once multiple get to be performed in a single act. Lazarus has called this the progressive "condensation" of thought. ... Steps really sink from sight. An advanced thinker sees the relations of his topics is such masses and so instantaneously that when he comes to explain to younger minds it is often hard ... Bowditch, who translated and annotated Laplace's Méchanique Céleste, said that whenever his author prefaced a proposition by the words "it is evident," he knew that many hours of hard study lay before him.