From McCraw’s summary of an article entitled “The Function of Entrepreneurs and the Interest of the Worker” that Schumpeter published in 1927 in a labor magazine :
(p. 178) Schumpeter’s key point here is one he hammered home many times: it is the insatiable pursuit of success, and of the towering premium it pays, that drives entrepreneurs and their investors to put so much of their time, effort, and money into some new project whose future is completely uncertain. High entrepreneurial returns are essential to generate gains not only for individuals but also for society, through the creation of new jobs.
McCraw, Thomas K. Prophet of Innovation: Joseph Schumpeter and Creative Destruction. Cambridge, Mass.: Belknap Press, 2007.