propriety

Nature makes the first demand on human beings (the sensuous, dependent)

Reason makes the second demand on human beings (the moral, rational, independent) - it is a person's duty not to let nature prevail over him but rather to master it.

In this way, Propreity is permissible to make the thrid ddemand on human begins (overlapping sensuous and the moral, the act of rationality upon the sensuous).