"Motivation comes from within each individual. It's a personal thing. It's pride, guts, desire, whatever you want to call it; some people have it in their bellies, and some don't."

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This work should commence with the conception of man, and should describe the nature of the womb, and how the child inhabits it, and in what stage it dwells there, and the manner of its quickening and feeding, and its growth, and what interval there is between one stage of growth and another, and what thing drives it forth from the body of the mother, and for what reason it sometimes emerges from the belly of its mother before the due time.

— Leonardo da Vinci