Psychology has a long past, but only a short history.

Often, even after years, mental states once present in consciousness return to it with apparent spontaneity and without any act of the will; that is, they are reproduced involuntarily.

Mental events, it is said, are not passive happenings but the acts of a subject.

The musician writes for the orchestra what his inner voice sings to him; the painter rarely relies without disadvantage solely upon the images which his inner eye presents to him; nature gives him his forms, study governs his combinations of them.

No matter how thoroughly a person may have learned the Greek alphabet, he will never be in a condition to repeat it backwards without further training.

What is true [in psychology] is alas not new, the new not true.

The constant flux and caprice of mental events do not admit of the establishment of stable experimental conditions.