Whether sin is fittingly divided into sin against God, against oneself, and against one's neighbor?

❌ Objection 1 : It would seem that sin is unfittingly divided into sin against God, against one's neighbor, and against oneself. For that which is common to all sins should not be reckoned as a part in the division of sin. But it is common to all sins to be against God: for it is stated in the definition of sin that it is "against God's law," as stated above (Question [66], Article [6]). Therefore sin against God should not be reckoned a part of the division of sin.

❌ Objection 2 : Further, every division should consist of things in opposition to one another. But these three kinds of sin are not opposed to one another: for whoever sins against his neighbor, sins against himself and against God. Therefore sin is not fittingly divided into these three.

❌ Objection 3 : Further, specification is not taken from things external. But God and our neighbor are external to us. Therefore sins are not distinguished specifically with regard to them: and consequently sin is unfittingly divided according to these three.