To be evenminded is the greatest virtue.Wisdom is to speakthe truth and actin keeping with its nature.
Heraclitus
Your assumptions are your windows on the world. Scrub them off every once in a while, or the light won't come in.
Isaac Asimov
When my information changes, I alter my conclusions. What do you do, sir?
John Maynard Keynes
If someone is able to show me that what I think or do is not right, I will happily change, for I seek the truth, by which no one was ever truly harmed. It is the person who continues in his self-deception and ignorance who is harmed.
Marcus Aurelius
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