A teacher is one who makes himself progressively unnecessary. Thomas Carruthers

Education has produced a vast population able to read but unable to distinguish what is worth reading. G. M. Trevelyan

Education makes a people easy to lead, but difficult to drive; easy to govern, but impossible to enslave. Lord Brougham 

The mind is not a vessel to be filled, but a fire to be kindled. Plutarch

The day you stop learning is the day you begin decaying. Isaac Asimov

A little learning is a dangerous thing. Alexander Pope

Perplexity is the beginning of knowledge. Kahlil Gibran

The greatest obstacle to discovery is not ignorance - it is the illusion of knowledge. Daniel J. Boorstin

Doubt grows with knowledge. Johann Wolfgang von Goethe

Believe those who are seeking the truth; doubt those who find it. André Gide

Experience is a hard teacher because she gives the test first, the lesson afterwards. Vernon Law

Experience is the name every one gives to their mistakes. Oscar Wilde

I honestly beleave it iz better tew know nothing than two know what ain’t so. Wisdum don’t konsist in knowing more that iz new, but in knowing less that iz false. Josh Billing (pen name of Henry Wheeler Shaw)

Those who will not reason, are bigots, those who cannot, are fools, and those who dare not, are slaves. Lord Byron

The know-nothings are, unfortunately, seldom the do-nothings. Mignon McLaughlin

The right to be heard does not automatically include the right to be taken seriously. Hubert Humphrey

All human knowledge is uncertain, inexact, and partial. Bertrand Russell

What men really want is not knowledge but certainty. Bertrand Russell

The intelligence of the planet is constant and the population is growing. Arthur C. Clarke

The average PhD thesis is nothing but the transference of bones from one graveyard to another. J. Frank Dobie 

Education is the inculcation of the incomprehensible into the indifferent by the incompetent. John Maynard Keynes

I don't know whether the world is full of smart men bluffing or imbeciles who mean it. Morrie Brickman

An optimist is someone who fills up his crossword puzzle in ink . Clement K. Shorter

The surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us. Bill Watterson

Some drink deeply from the river of knowledge. Others only gargle. Woody Allen

Wisdom comes from experience. Experience is often a result of lack of wisdom. Terry Pratchett

Most people are fools, most authority is malignant, God does not exist, and everything is wrong. Ted Nelson