The man who succeeds above his fellows is the one who early in life, clearly discerns his object, and towards that object habitually directs his powers. Even genius itself is but fine observation strengthened by fixity of purpose. Every man who observes vigilantly and resolves steadfastly grows unconsciously into genius.
Success is not something I've wrapped my brain around. If people go to those movies, then yes, that's true, big-time success. If not, it's much ado about nothing. [On the prospects for his 1997 movies The Rainmaker and Good Will Hunting]
One might think that the money value of an invention constitutes its reward to the man who loves his work. But speaking for myself, I can honestly say this is not so... I continue to find my greatest pleasure, and so my reward, in the work that precedes what the world calls success.