I just have a simple thought today. It's the theme (if not exact quote) from a talk I've been reading. It's simple:
God has given you everything and has everything, The only thing he can't have without you giving is your heart and your will. That's all he wants. He doesn't really want your time--he gives you every breath; he doesn't really want your money--he gave you the whole world. What he really wants is you. Once you give yourself, then your sacrifice of everything else he asks is right. That's the point of it all. It's simple.