I think I'll live by the second one as my motto in life then again. My motto normally is: "Do what you want, not what others want you to do. Life's insane as it is. But you have to be crazier than life to survive. Trust your instincts, they'll tell you more than what your heart will. Because what use are emotions in situations that need you to think and act without hesitation?"
In short; "It's now or never."