I fear not the man who has practiced 10,000 kicks once, but I fear the man who had practiced one kick 10,000 times.
- Bruce Lee
My biggest advice is if you feel that what you're working on every day is not really what makes you happy, change. Start finding something else. It may take you six months, it may take you a year. But honestly, don't spend a day of your life working on anything other than the stuff that makes you happy.
- Mo Gawdat, previous Chief Executive at Google X.