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We must regard all laws or theories as hypothetical or conjectural; that is, as guesses.

Karl Popper

The simple truth is that truth is hard to come by, and that once found may easily be lost again.
KARL POPPER

Easy Hard Lost Philosophy Simplicity Truth
History has no meaning.
KARL POPPER

History One Liner
No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.
KARL POPPER

Argument Man Philosophy Science
Those who promise us paradise on earth never produced anything but hell.
KARL POPPER

Hell Philosophy
Science is most significant as one of the greatest spiritual adventures that man has yet known.
KARL POPPER

Adventure Greatness Man Science Spiritual
I would rather find a single causal law than be the king of Persia!
KARL POPPER

Law Myself
In my view, aiming at simplicity and lucidity is a moral duty of all intellectuals: lack of clarity is a sin, and pretentiousness is a crime.
KARL POPPER

Crime Duty Moral Myself Philosophy Simplicity Sin
Great men may make great mistakes.
KARL POPPER

Greatness Men Mistake One Liner
In philosophy methods are unimportant; any method is legitimate if it leads to results capable of being rationally discussed.
KARL POPPER

Important Philosophy Result
The game of science is, in principle, without end.
KARL POPPER

End Game One Liner Principle Science
It is complete nihilism to propose laying down arms in a world where atom bombs are around. It is very simple: there is no way of achieving peace other than with weapons.
KARL POPPER

Achieve Peace Simplicity Weapon World
It is wrong to think that belief in freedom always leads to victory; we must always be prepared for it to lead to defeat. If we choose freedom, then we must be prepared to perish along with it.
KARL POPPER

Believe Choice Freedom Lost Philosophy Prepare Thinking Victory Wrong
Theories are nets cast to catch what we call ‘the world’: to rationalize, to explain, and to master it. We endeavor to make the mesh ever finer and finer.
KARL POPPER

Fine Perfection Theory World
If our civilization is to survive, we must break with the habit of deference to great men.
KARL POPPER

Break Greatness Men Ourselves Survive
And it implies that if we respect truth, we must search for it by persistently searching for our errors: by indefatigable rational criticism, and self-criticism.
KARL POPPER

Philosophy Respect Search Truth
The way of science is paved with discarded theories that were once declared self-evident.
KARL POPPER

Evidence Science Theory Way

We must regard all laws or theories as hypothetical or conjectural; that is, as guesses.

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We must regard all laws or theories as hypothetical or conjectural; that is, as guesses.

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