What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.

Sigmund Freud

The first method for estimating the intelligence of a ruler is to look at the men he has around him.

Niccolò Machiavelli

Being busy does not always mean real work. The object of all work is production or accomplishment and to either of these ends there must be forethought, system, planning, intelligence, and honest purpose, as well as perspiration. Seeming to do is not doing.

Thomas Alva Edison

The intelligent man who is proud of his intelligence is like the condemned man who is proud of his large cell.

Simone Weil

Nature shows that with the growth of intelligence comes increased capacity for pain, and it is only with the highest degree of intelligence that suffering reaches its supreme point.

Arthur Schopenhauer

There are unknown forces in nature; when we give ourselves wholly to her, without reserve, she lends them to us; she shows us these forms, which our watching eyes do not see, which our intelligence does not understand or suspect.

Auguste Rodin

Sensible and responsible women do not want to vote. The relative positions to be assumed by man and woman in the working out of our civilization were assigned long ago by a higher intelligence than ours.

Grover Cleveland