1 Peter 2:5 says that we are "to offer up spiritual sacrifices acceptable to God". So when you make these spiritual sacrifices, you are wanting God to accept them. These spiritual sacrifices which we give Him are because of our relationship ... our intimacy ... with Jesus Christ. They tie us into "altars" because our altar is in us.
We give to Him these sacrifices on our altar and God accepts them because Jesus is our Savior and Lord. We are supposed to do these based on our own life when things are going on.
Reverend Robert W. & Mary C. Butler