Profundity of thought belongs to youth, clarity of thought to old age.
-Friedrich Nietzsche

 

Either you reach a higher point today, or you exercise your strength in order to be able to climb higher tomorrow.
-Friedrich Nietzsche

 

Many are stubborn in pursuit of the path they have chosen, few in pursuit of the goal.
-Friedrich Nietzsche

 

In the true man there is a child concealed who wants to play.
-Friedrich Nietzsche

 

No matter how complicated a problem is, it usually can be reduced to a simple, comprehensible form which is often the best solution.
-An Wang

 

The two most important requirements for major success are: first, being in the right place at the right time, and second, doing something about it.
-Ray Kroc

 

The nervous system and the automatic machine are fundamentally alike in that they are devices, which make decisions on the basis of decisions they made in the past.
-Norbert Wiener

 

To live effectively is to live with adequate information.
-Norbert Wiener

 

The trick is to combine your waking rational abilities with the infinite possibilities of your dreams. Because, if you can do that, you can do anything.
-Guy Forsyth

 

An empty head is not really empty; it is stuffed with rubbish. Hence the difficulty of forcing anything into an empty head.
-Eric Hoffer

 

Far more crucial than what we know or do not know is what we do not want to know.
-Eric Hoffer

 

It is the child in man that is the source of his uniqueness and creativeness, and the playground is the optimal milieu for the unfolding of his capacities and talents.
-Eric Hoffer

 

It still holds true that man is most uniquely human when he turns obstacles into opportunities.
-Eric Hoffer

 

The real Antichrist is he who turns the wine of an original idea into the water of mediocrity.
-Eric Hoffer

 

We can be absolutely certain only about things we do not understand.
-Eric Hoffer

 

We are successful because we use the right level of abstraction.
-Avi Wigderson

 

All the wonders of our universe can in effect be captured by simple rules, yet [...] there can be no way to know all the consequences of these rules, except in effect just to watch and see how they unfold.
-Stephen Wolfram ("A New Kind of Science", p. 846)

 

There are worse crimes than burning books. One of them is not reading them.
-Joseph Brodsky

 

To find yourself, think for yourself. 
-Socrates

 

One never knows what each day is going to bring. The important thing is to be open and ready for it.
-Henry Moore

 

We're drowning in information and starving for knowledge.

-Rutherford Rogers

 

Patience is the companion of wisdom.

-St. Augustine

 

It is impossible to defeat an ignorant man in argument.

-William G. McAdoo

 

vital cities have marvelous innate abilities for understanding, communicating, contriving and inventing what is required to combat their difficulties. Lively, diverse, intense cities contain the seeds of their own regeneration, with energy enough to carry over for problems and needs outside themselves.
-Jane Jacobs, Death and Life of Great American Cities, 1961

 

It is the commonest of mistakes to consider that the limit of our power of perception is also the limit of all there is to perceive

-C.W. Leadbeater

 

Man is equally incapable of seeing the nothingness from which he emerges and the infinity in which he is engulfed.
-Blaise Pascal

 

An author is a fool who, not content with boring those he lives with, insists on boring future generations.
-Charles Montesquieu

 

We cling to our own point of view, as though everything depended on it. Yet our opinions have no permanence; like autumn and winter, they gradually pass away.
-Chuang Tzu

 

Harsh counsels have no effect; they are like hammers, which are always repulsed by the anvil
-Claude Arien Helvetius

 

If you do not change the direction in which you are going, you will end up where you are headed.
-Confucius

 

Only the wisest and stupidest of men don't change.
-Confucius

 

Real knowledge is to know the extent of one's ignorance.
-Confucius

 

Do not follow the ideas of others, but learn to listen to the voice within yourself. Your body and mind will become clear and you will realize the unity of all things.
-Dogen, Japanese Buddhist monk and philosopher, 1200-1253

 

Man never made any material as resilient as the human spirit.
-Bernard Williams

 

Never contend with a man who has nothing to lose.
-Baltasar Gracian

 

Every person takes the limits of their own field of vision for the limits of the world.
-Arthur Schopenhauer

 

It is the mark of an educated mind to be able to entertain a thought without accepting it.
-Aristotle

 

Never forget that life can only be nobly inspired and rightly lived if you take it bravely and gallantly, as a splendid adventure in which you are setting out into an unknown country, to face many a danger, to meet many a joy, to find many a comrade, to win and lose many a battle.
-Annie Besant

 

Seek simplicity, and distrust it.
-Alfred North Whitehead

 

Children are natural Zen masters; their world is brand new in each and every moment.
-John Bradshaw

 

Arriving at one goal is the starting point to another.
-John Dewey

 

Without some goals and some efforts to reach it, no man can live.
-John Dewey

 

We only think when we are confronted with problems.
-John Dewey

 

New opinions are always suspected, and usually opposed, without any other reason but because they are not already common. (An Essay concerning Human Understanding)
-John Locke

 

Every great movement must experience three stages: ridicule, discussion, adoption.
-John Stuart Mill

 

For a game it is too serious, for seriousness too much of a game.
-Moses Mendelsson

 

The key to wisdom is this - constant and frequent questioning... for by doubting we are led to question and by questioning we arrive at the truth.
-Peter Abelard

 

There is not less wit nor less invention in applying rightly a thought one finds in a book, than in being the first author of that thought.
-Pierre Bayle

 

Every great advance in natural knowledge has involved the absolute rejection of authority.

-Thomas Huxley

 

The great principle of human satisfaction is engagement.
-William Paley

 

If one does not know to which port one is sailing, no wind is favourable.
-Seneca

 

I think, therefore I am.
-Rene Descartes

 

Art is only Nature operating with the aid of the instruments she has made.
-Paul Henri

 

Ideas are invented only as correctives to the past. Through repeated rectification of this kind one may hope to disengage an idea that is valid.
-Gaston Bachelard