The heart is the key to entering the Lord's heart. If we can give our heart totally to God, then becoming detached to our own family and all things of the world and giving our possesions away when we are called to do will no longer be any problem. The heart is the most precious thing to us. If God can have it, then surely he can have everything else.
Once God has your heart, he'll put whatever pleases him in it and you'll be transormed into a beautiful, new creature before him.