[quote="SpringWater, post:1, topic:351680"]
God doesn't forgive your sins if you don't forgive others.
How much is this true?
By confession sins are forgiven, if you do not forgive others how would these sins be forgiven?
It is true inasmuch as that is what we ask for in prayer, and inasmuch as that is what we are told concerning God's love. It would be quite convenient if we were forgiven but we could hold a grudge (or worse, hate) those who have offended us.
This is in fact a striking tenet that characterized Christianity: the commandment to "love our enemies and forgive those who persecute us". This was unprecedented. And the reason people would (and still do) follow it is because of our belief that such is the way by which we ourselves are forgiven our offenses.
That is not to be confused with sacramental confession by which we are forgiven by God through the Church of the offenses we made to God and the Church (meaning - the community of all the faithful). Such sins include those who, according to human standards, "harm no one", but that actually harm ourselves and offend the dignity of other fellow men. What happens in the sacrament is the supernatural infusion of the sanctifying baptismal grace which is lost in the case of grave sins, whereby we believe our soul is mortally wounded. It is a purely spiritual matter involving the soul. Now, even sacramental confession is invalid (meaning, the sin is not forgiven) if we have not firmly repented of our offense and attempted (or decided to attempt) reparation (whether it be reconciliation with someone, asking someone to forgive us, etc.).