When does God stop forgiving us of our sins?

We are save by grace alone, however we must live the life we say that we are. If we say we are Christian, then the life we live must be that of a Christian. Other words are deeds must match who and what we are. Jesus can read our minds and our hearts and the works you do can't save you, but the deeds that you do tells him who you really are. Jesus will forgive you forever if he has to but if you are indeed a good Christian, you will try very hard not to sin as in each sin you are telling Jesus that he died for nothing.