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The only real security that a man can have in this world is a reserve of knowledge, experience and ability.
Knowledge which is acquired under compulsion obtains no hold on the mind.
Knowledge is true opinion.
Doubt grows with knowledge.
When you know a thing, to hold that you know it, and when you do not know a thing, to allow that you do not know it – this is knowledge.
No man can reveal to you nothing but that which already lies half-asleep in the dawning of your knowledge.
Knowledge is knowing that we cannot know.
Perplexity is the beginning of knowledge.
To know, is to know that you know nothing. That is the meaning of true knowledge.
Human behavior flows from three main sources: desire, emotion, and knowledge.