Forgiveness of sin means God pardoning us from our iniquities. Dealing with us pure without our looking at the offense we commit.
Sin has a way has a way of separating is from God. Not because God despise us but our conscience won't let us. Our conscience will make us feel we are far from God. But it's not so, grace restores us to God.
However, they are two ways in which we sin. some sins are planed while others are not. The sin that is planed is hard to be forgiven but the sin that happened coexidental can be forgiven.
Another case, that Bro Eli said, is of you watch a person commit a particular sin, over time you will also commit the same sin. So we must guard ourselves not to be a victim of this.
In as much as Grace restores us to God. We must endeavour to stay out of planned sin.
Thank you.馃槉