“ You must have a level of discontent to feel the urge to want to grow. ”
Source: Wealth for All: Living a Life of Success at the Edge of Your Ability
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I count him braver who overcomes his desires than him who conquers his enemies, for the hardest victory is over self. 
You can live to be a hundred if you give up all the things that make you want to live to be a hundred. 
No person is your friend who demands your silence, or denies your right to grow. 
Never let hard lessons harden your heart; the hard lessons of life are meant to make you better, not bitter. 