Discipline
Discipline is a critical factor in success. It is the attribute necessary to achieve excellence in any pursuit, art, music, academics or athletics. The ability to focus on what is needed rather than what is wanted is the critical ingredient to identifying and achieving goals. Without discipline, even raw talent is not as helpful. Theodore Roosevelt said "With great self-discipline, anything is possible."
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Anonymous commented
To add:
Do things the right way first. Not to cut corners or look for self/instant gratification. Success is earned, not bought. You have to work hard for what you want. With discipline, the final product will be more sustainable than the which is missing a strong foundation.