Rational nature is the radical capacity for rationality, which unborn humans possess. A rational agent is a being whose rationality necessarily places it under binding reasons. Our rationality necessarily entails that we have reason against being irrational. 1. To will the destruction of any thing while depending upon said thing is irrational. 2. Every rational agent depends upon rational nature as the condition of becoming a rational agent in the first place. Therefore, rational agents have reason against willing the destruction of rational nature.