Date: 1752, 1791

"Thy appetites in easy tides / (As reason's luminary guides) / Soft flow--no wind can work them to a storm, / Correctly quick, dispassionately warm."

— Smart, Christopher (1722-1771)

Date: September 10, 1836

"Nevertheless, far different from the deaf and dumb nature around them, these all rest like fountain-pipes on the unfathomed sea of thought and virtue whereto they alone, of all organizations, are the entrances."

— Emerson, Ralph Waldo (1803-1882)

Date: 1901-2, 1902

"Few people who have not expressly reflected on the matter realize how constantly this factor of inhibition is upon us, how it contains and moulds us by its restrictive pressure almost as if we were fluids pent within the cavity of a jar."

— James, William (1842-1910)

Date: March 11, 2011

"The huge submerged bulk of the mental iceberg, with its stores of memory and acquired skills that have become automatic, like language, driving and etiquette, supplies people with the raw materials on which they can exercise their reason and decide what to think and what to do."

— Nagel, Thomas (b. 1937)