In this case it is very clear, A man is to be slow to anger and forgiving of a repentant man a thousand times seven but it is also clear that to forgive sin when their is no repentance is not righteous.
I agree about taking the whole of Scripture.
It appears to me that on this issue, you do not.
That one verse does NOT trump all the others.
Scripture is clear that we MUST FORGIVE
as we would like to BE FORGIVEN.
Christ’s prayer—THE LORD’S PRAYER—FROM GOD’S OWN MOUTH—IS ABUNDANTLY CLEAR on the matter.