Research now shows that the lack of natural talent is irrelevant to great success. The secret? Painful and demanding practice and hard work. 
Hard work, in contrast to sloth and laziness, is the idea of persevering toward a worthy goal and achieving it to better one's life. The American system was built upon the ideas of hard work and work effort and to this day hard work is rewarded and rewarding hard work is one of the major principles of conservatism.