God forgives his children who repent. Consider Satan who never repented.

Repentance is internal. We change our heart to allow grace. As you present it, it is external from God, He “injects” grace whether we resist or not.

That, of course, was Calvin’s thesis - grace was irresistible.

That leads to all sorts of problems with a theology, as Calvin demonstrated. God becomes a super Borg - resistance is futile.

A good walk through the theology of the sacrament of Penance would clarify this.