You've definitely got to watch this video completely. I've always admired Will Smith but now I totally respect him as well.
He has such an enthusiasm for life and lives it so powerfully that anyone can get inspired by his passion.
A few quotes from the video:
"You have to believe it. There's no reason to have a plan B 'cause it distracts from plan A."
"Being realistic is the most commonly travelled road to mediocrity."
"The second I decide it's done, it's done."
And he also quotes Confucious "He who says he can and he who says he can't are both usually right."
I find these all so true.