 The self-evidence Ross attributes to moral propositions is weaker in that whereas on (SE) a self-evident proposition will be evident for any person who understands it, according to Ross a self-evident moral proposition is evident for any person who has attained sufficient mental maturity and given the proposition sufficient attention. Hence, on Ross’s conception, a self-evident proposition, PSE, might not be justified for some, and perhaps even many, who understand it; PSE may not be evident to persons who understand it if they either lack sufficient mental maturity or have not considered PSE  sufficiently.[6]  Depending upon what is required for sufficient mental maturity and sufficient consideration, self-evident moral propositions might be evident, in virtue of their self-evidence, for precious few actual individuals. Here’s one way to think about it: Rossian self-evidence has less epistemic potency—a person must satisfy more conditions for a self-evident moral proposition to be evident than merely understanding it.