philosophy,
derived in part from reading Ayn Rand's book Atlas shrugged.
A big part of her philosophy is ability.
In my mind what makes you somebody in this world is more than that, your thoughts and feelings do not do anything by themselves.
What makes a difference is Action inaction and interaction. You can create anything in your mind but without acting on it to build it or interacting effectively to gain help in creating your ideas or influencing the way the world is, you will have done nothing.
Feeling sad or drunk or inferior or dreaming all day does nothing.. I guess this is where Nike has it right, just do it.