Living in Grace....

What do we answer someone who justifies their bad decision making by saying they will repent on their deathbed because they will still receive God's grace?  It is an interesting concept - sin as much as you want, knowing, without question, that God's gracious forgiveness is freely available to all who repent.  Salvation is, after all, a gift freely given, without qualification, no matter what we have done or left undone.  It is there for the taking; all we need to do is accept it.

So how do we answer the person who justifies all manner of indiscretion this way?  And, if we are brutally honest with ourselves, do we not sometimes also justify ourselves in this same way?