Do you have any famous quotation that affects your life?

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Previously I was a teacher teaching ESL in my country. Teaching has never been in my ambition list but being a filial daughter I followed my parents wish. So, for 14 years I was there teaching and making a living until one day I stumbled upon a quotation from Mark Twain: TWENTY YEARS FROM NOW YOU WILL BE MORE DISAPPOINTED BY THE THINGS THAT YOU DIDN'T DO THAN BY THE ONES YOU DID DO. SO, THROW OFF THE BOWLINES. SAIL AWAY FROM THE SAFE HARBOUR. CATCH THE TRADE WINDS IN YOUR SAILS. EXPLORE. DREAM. DISCOVER. -MARK TWAIN, AMERICAN AUTHOR Upon reading this, I've realized that I need to make a change in my life so that I will not have any regrets later in life. So, last April 22, 2010 I actually quit to focus on writing in my first language. I do not want to be disappointed by the things that i didn't do twenty years from now. What about you? Do you have any famous quotation that affects your life?