Last night I was greatly edified and challenged by John MacArthur's recent book Slave. I commend it to you. I liked this quote from Charles Spurgeon.
Every true Christian pronounces this phrase, "Jesus our Lord," with the emphasis of unreservedness. We desire that Christ Jesus should be our Lord in everything and Lord over every part of our being....He who truly loves Jesus, and who knows that he is one of those who are redeemed by him, says with all his heart that Jesus is Lord, his absolute Sovereign, his Despot, if that word be used in the sense of Christ having unlimited monarchy and supreme sway over the soul. Yea, O "Jesus our Lord," thou shalt be the autocratic, imperial Master of our heart, and of the whole dominion of our manhood!
The book closes with its major point: "To be a Christian is to be a slave of Christ."