“I could not think without writing.”

“The principle goal of education in the schools should be creating men and women who are capable of doing new things, not simply repeating what other generations have done; men and women who are cre...”

“From this time on, the universe is built up into an aggregate of permanent objects connected by causal relations that are independent of the subject and are placed in objective space and time.”

“Play is the work of childhood.”

“The main functions of intelligence, that of inventing solutions and that of verifying them, do not necessarily involve one another. The first partakes of imagination; the second alone is properly l...”

“Logical activity is not the whole of intelligence. One can be intelligent without being particularly logical.”