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The only good is knowledge, and the only evil is ignorance.
--
The words of Socrates, as quoted by Diogenes Laertius.

 

Herodotus

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When it is stated in Genesis that God said to Adam, “Only from the tree of the knowledge of good and evil you must not eat,” it follows as a matter of course that Adam really has not understood this word, for how could he understand the difference between good and evil when this distinction would follow as a consequence of the enjoyment of the fruit. When it is assumed that the prohibition awakens the desire one acquires knowledge instead of ignorance, and in that case Adam must have had knowledge of freedom, because the desire was to use it. The explanation is therefore subsequent. The prohibition induces in him anxiety, for the prohibition awakens in him freedom’s possibility. What passed by innocence as the nothing of anxiety has now entered into Adam, and here again it is a nothing-the anxious possibility of being able. He has no conception of what he is able to do; otherwise-and this it what usually happens-that which comes later, the difference between good and evil, would have to be presupposed. Only the possibility of being able is present as a higher form of ignorance, as a higher expression of anxiety, because in a higher sense it both is and is not, because in a higher sense he both loves it and flees from it. The Concept of Anxiety p. 44-45

 

Soren Aabye Kierkegaard

 

He said that there was one only good, namely, knowledge; and one only evil, namely, ignorance.

 

Diogenes Laertius

 

There is only one good, knowledge, and one evil, ignorance.

 

Socrates

 

I affirm, in words as true and literal as any that belong to geometry, that the man who withholds knowledge from a child not only works diabolical miracles for the destruction of good, but for the creation of evil also. He who shuts out truth, by the same act opens the door to all the error that supplies its place. Ignorance breeds monsters to fill up all the vacuities of the soul that are unoccupied by the verities of knowledge. He who dethrones the idea of law, bids chaos welcome in its stead. Superstition is the mathematical complement of religious truth; and just so much less as the life of a human being is reclaimed to good, just so much more is it delivered over to evil. The man or the institution, therefore, that withholds knowledge from a child, or from a race of children, exercises the awful power of changing the world in which they are to live, just as much as though he should annihilate all that is most lovely and grand in this planet of ours, or transport the victim of his cruelty to some dark and frigid zone of the universe, where the sweets of knowledge are unknown, and the terrors of ignorance hold their undisputed and remorseless reign.

 

Horace Mann

 

The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know, our knowledge of our ignorance. For this, indeed, is the main source of our ignorance — the fact that our knowledge can be only finite, while our ignorance must necessarily be infinite.

 

Karl Popper