The number-one job of the hedge-fund manager is not to make sure that you can retire with a smile on your face - it's for him to retire with a smile on his face.
Mark CubanWhat does it take to be a successful entrepreneur? It takes willingness to learn, to be able to focus, to absorb information, and to always realize that business is a 24/7 job where someone is always out there to kick your ass.
Mark CubanDon't start a company unless it's an obsession and something you love. If you have an exit strategy, it's not an obsession.
Mark Cuban