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No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.

Karl Popper

We must plan for freedom, and not only for security, if for no other reason than only freedom can make security more secure.
KARL POPPER

Freedom Philosophy Reason Security
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
Our knowledge can only be finite, while our ignorance must necessarily be infinite.
KARL POPPER

Deep Knowledge Necessary Philosophy
Great men may make great mistakes.
KARL POPPER

Greatness Men Mistake One Liner
A theory that explains everything, explains nothing.
KARL POPPER

One Liner Philosophy Theory
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
Always remember that it is impossible to speak in such a way that you cannot be misunderstood: there will always be some who misunderstand you.
KARL POPPER

Impossible Philosophy Remember Speak Yourself
“We don’t know anything” and believed that this was the most important philosophical truth.
KARL POPPER

Believe Important Philosophy Truth
The conspiracy theory of society, comes from abandoning God and then asking: “Who is in his place?”
KARL POPPER

Abandonment God Himself Place Spiritual Theory
Instead of the greatest happiness for the greatest number, one should demand, more modestly, the least amount of avoidable suffering for all.
KARL POPPER

Avoid Demand Greatness Happiness Philosophy Prayer Suffering
Every intellectual has a very special responsibility. He has the privilege and the opportunity of studying.
KARL POPPER

Himself Privilege Responsibility Special Study
I would rather find a single causal law than be the king of Persia!
KARL POPPER

Law Myself
We can all participate in the heritage of man. We all can help to preserve it. And we can all make our own modest contribution to it.
KARL POPPER

Help Man Nature Ourselves
If we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them.
KARL POPPER

Deep Destroy Oppression Philosophy Prepare Tolerance
True ignorance is not the absence of knowledge, but the refusal to acquire it.
KARL POPPER

Knowledge Philosophy True
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

No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.

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No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.

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