"No man taketh it from me, but I lay it down of myself. I have power to lay it down, and I have power to take it again. This commandment have I received of my Father." -- John 10:18
God commanded Christ to lay down His life for His sheep, which He did, willingly, "for the joy that was set before him" (the "joy" being the salvation of His elect.)
"Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God." -- Hebrews 12:2
God commanded Christ? There you go again, separating God from Christ!