Minds are like parachutes - they only function when open.

— Thomas Dewar

A person’s mind stretched to a new idea never returns back to its original dimensions.

— Oliver Wendell Holmes Sr.

The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.

— Sir William Bragg

“Learn to think,” wrote an ancient. “It will profit you well, for there is so little competition.”

— Unknown

Reading and conversing upon a subject will never make a man master of it, without close and steady thinking, and a fair …

— Unknown

From seventy to ninety per cent of the thinking of the people is ancestral.

— Newton D. Baker