I don't sing because I'm happy; I'm happy because I sing.

It would probably astound each of them beyond measure to be let into his neighbor's mind and to find how different the scenery there was from that in his own.

Round about the accredited and orderly facts of every science there ever floats a sort of dust-cloud of exceptional observations, of occurrences minute and irregular and seldom met with, which it always proves more easy to ignore than to attend to... Anyone will renovate his science who will steadily look after the irregular phenomena, and when science is renewed, its new formulas often have more of the voice of the exceptions in them than of what were supposed to be the rules.

The absolute things, the last things, the overlapping things, are the truly philosophic concerns; all superior minds feel seriously about them, and the mind with the shortest views is simply the mind of the more shallow man.

In all primary school work the principle of multiple impressions is well recognized.

The good or bad is not in the circumstance, but only in the mind...that encounters it.

To be radical, an empiricism must neither admit into its constructions any element that is not directly experienced, nor exclude from them any element that is directly experienced.