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., Confucius, The Confucian Analects, Chinese philosopher reformer (551 BC 479 BC)
I think therefore I am., Rene Descartes, French mathematician philosopher (1596 1650)
There are three things which if one does not know, one cannot live long in the world: what is too much for one, what is too little for one, and what is just right for one., Swahili proverb,
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Let not a man guard his dignity, but let his dignity guard him., Ralph Waldo Emerson, US essayist poet (1803 1882)
The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts., Bertrand Russell, British author, mathematician, philosopher (1872 1970)
It is one of the severest tests of friendship to tell your friend his faults. So to love a man that you cannot bear to see a stain upon him, and to speak painful truth through loving words, that is friendship., Henry Ward Beecher, US abolitionist clergyman (1813 1887)