Adam Clarke on Galatians 6:14

But God forbid that I should glory - Whatever others may do, or whatever they may exult or glory in, God forbid that I should exult, except in the cross of our Lord Jesus Christ; in the grand doctrine, that justification and salvation are only through Christ crucified, he having made an atonement for the sin of the world by his passion and death. And I glory, also, in the disgrace and persecution which I experience through my attachment to this crucified Christ.

By whom the world is crucified unto me - Jewish rites and Gentile vanities are equally insipid to me; I know them to be empty and worthless. If Jews and Gentiles despise me, I despise that in which they trust; through Jesus, all are crucified to me - their objects of dependence are as vile and execrable to me, as I am to them, in whose sight these things are of great account.