We have an obligation to prevent harms to our rational nature and we have an obligation to resist our own oppression. We have an obligation to resist attempts to hinder our capacity to act rationally. In addition to having an obligation to resist the oppression of others, people have an obligation to themselves to resist their own oppression. When you have an obligation to do something, that obligation is not an absolute moral claim on your actions. If you have an obligation or duty to do something, that is a very good reason for acting in a particular way, but not a conclusive reason for doing so.