Mind

"What has multiplied the "productivity of labor" is not some degree of effort on the part of manual workers, but the accumulation of capital by the savers and its reasonable employment by the entrepreneurs. Technological inventions would have remained useless trivia if the capital required for their utilization had not been previously accumulated by thrift. Man could not survive as a human being without manual labor. However, what elevates him above the beasts is not manual labor and the performance of routine jobs, but speculation, foresight that provides for the needs of the — always uncertain — future. The characteristic mark of production is that it is behavior directed by the mind." Mises