Calvin and Piety
Calvin continually exhorts his readers to piety and consistently criticizes authorities and teachings that stand in the way of piety or of the teaching of piety (doctrina, exercitia, or studium fietatis), but he never describes what he is doing as a form of piety. Piety was to be conjoined with "teaching" or "doctrine" (doctrina): Calvin did not understand it as an exercise separable from his teaching, preaching, and debating.
Richard Muller. The Unaccommodated Calvin (New York, NY: Oxford University Press, 2000), 107