For whosoever exalteth himself shall be abased; and he that humbleth himself shall be exalted. – LUKE 14:11
A person who stands on his tiptoes cannot stand long, and a person who is too proud of himself cannot set a good example. – LAO-TZU
He who is looking for wisdom is already wise; and he who thinks that he has found wisdom is a stupid man. – EASTERN WISDOM
No exterior force can make you humble. There is only one way to be humble: do not think about yourself, but about how you can serve God and others.
From – A Calendar of Wisdom, Tolstoy, Leo
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See also this quote by Thomas A. Kempis