1 Chronicles 21 tells of a time in King David's life when he was directed to offer a special sacrifice to the Lord. When someone tried to step in a relieve the burden of his sacrifice, King David said, "No, but I will buy them for the full price. I will not take for the Lord what is yours, nor offer burnt offerings that cost me nothing." 1 Chronicles 21:24
Some have asked me if giving up soda or chocolate was "enough" for God to bless them during this time of fasting and prayer. I think King David makes it clear that whatever we do for the Lord should require significant sacrifice. If it doesn't cost you something, then it's not worth anything.
What are you willing to give up for God?