When I was trying to find my way early in my career, my boss gave me the following advice: "find a way to be world class at something." It didn't immediately click, but over the years that advice has been extremely valuable to me on many levels, and I am thankful I received it at such an early age.There are some cool answers in this Quora thread: http://www.quora.com/What-is-the-single-greatest-piece-of-career-advice-youve-ever-received?share=1