I based my sermon on the hymn When I Survey the Wondrous Cross.  And I think it is good, not just as Easter time, but throughout the year to focus on the cross.  Look at all the Jesus did for us and reflect on it’s implications.  Since he was willing to give his all for us, out of thankfulness and gratitude for this undeserved grace, we should give our all for him.  Or as the hymn concludes, “Demands my soul, my life, my all”.