How do you respond when a friend doesn't listen when he or she should?

When you have a close relationship with a friend and he or she doesn't listen to you or let themselves be influenced by you, what should you do?  It is exactly at this time that this person needs for you to be a friend to them.  They need for you to extend the mercy, kindness and forgiveness that the Lord Jesus taught.  When you are able to do that, then you will open the door for that relationship to be healed and restored.  If the friend does not respond to your generosity in the Lord, then that friend will have to live with the decision that they have made.  But if the friend does respond, you will now have a friendship that is stronger and better then before.