Entrepreneurs are simply those who understand that there is little difference between obstacle and opportunity and are able to turn both to their advantage.
I can not 'make my mark' for all time - those concepts are mutually exclusive. 'Lasting effect' is a self-contradictory term. Meaning does not exist in the future and neither do I. Nothing will have meaning 'ultimately. ' Nothing will even mean tomorrow what it did today. Meaning changes with the context. My meaningfulness is here. It is enough that I am of value to someone today. It is enough that I make a difference now.