Sacrifice

I think I'm beginning to understand sacrifice now... I thought I did before. It's when you give up something you want, right? Like a few hours on a sunday afternoon to cover in the worship team... or going out of your way to drop someone home. That's sacrifice right? It is. But I think there's more. I think that it's when you give up something and it leaves you physically hurting. It's something that you have no desire to do apart from obedience to God. The other end you canot see, so you can only walk forward in trust. Trust that God knows what He is doing and that His plan and purpose will prevail.

Yet I have a feeling that this isn't really a complete understanding either... thoughts?