Uncertainty is a sign of humility, and humility is just the ability or the willingness to learn.
Charlie SheenReligion, in its humility, restores man to his only dignity, the courage to live by grace.
George SantayanaA man who is eating or lying with his wife, or preparing to go to sleep in humility, thankfulness and temperance, is by Christian standards in an infinitely higher state than one who is listening to Bach or reading Plato in a state of pride.
C. S. LewisGenuine ignorance is... profitable, because it is likely to be accompanied by humility, curiosity and open mindedness, whereas ability to repeat catch-phrases, cant terms, familiar propositions, gives the conceit of learning and coats the mind with varnish waterproof to new ideas.
John Dewey