John Locke

"The discipline of the schoolmaster is called discipline; the discipline of a friend is called reproof."

"Constancy and truth form the foundation of all virtues."

"It is of great use to the sailor to know the length of his line, though he cannot with it fathom all the depths of the ocean."

"Time is the measure of business; everything has its proper time."

"The measure of a man is what he does with power."

"A man is as old as he feels, and as young as his dreams make him."

"Where there is no peace, there is no justice."

"The mind, in its natural state, is a blank tablet waiting to be written upon."

"Reputation is often got without merit, and lost without deserving it."

"The greatest discovery of all time is that a person can change his future by merely changing his attitude."

"Good humor is one of the preservatives of health."

"New opinions are always suspected, and usually opposed, without any other reason but because they are not already common."

"The purpose of government is the happiness of the governed."

"To love truth for truth's sake is the principal part of human perfection."

"Knowledge of our ignorance is the first step toward true learning."

"Patience and perseverance have a magical effect on almost everybody."

"We cannot always control our thoughts, but we can control our will."

"The art of war is simple enough: find out where your enemy is; get at him as soon as you can, strike him as hard as you can, and keep moving on."

"Nothing is so much to be feared as fear itself."

"The proper office of a friend is to side with you when you are in the wrong."

"A mind needs books as a sword needs a whetstone, if it is to keep its edge."