Joseph Schumpeter is famous for his theory of economic evolution and also for his economic sociology and history among other things. He worked also on other research areas, out of which the theory of history, where the benchmark was nothing less than the work of Marx, is worth recognition. The core or basis of these endeavours deserves further attention. I refer to Schumpeter's account of human nature including human action. In the current paper I clarify that account. I suspect that better acknowledgement of its various aspects may affect Schumpeter's place in the history of social sciences, interpretations of his work and ultimately also research frontier in all those fields that Schumpeter was working on.