I know that sins differ on the axis of gravity: how severe they are. The Catechism documents this.
I also know that sins differ as to whether they’re “intrinsically wrong” (that is, always wrong under any circumstance) or “extrinsically wrong” (that is, only wrong under some circumstances).
What I don’t know is where I should look to find out, authoritatively, whether a sin is intrinsically or extrinsically evil. It doesn’t seem to be documented in the Catechism, or if it is, I’m not understanding the wording that indicates that it is. Is there a single place I can go to find out whether a sin is intrinsically or extrinsically evil?