Jesus himself testifies of his voluntary sacrifice.
“For this reason the Father loves me, because I lay down my life that I may take it up again. No one takes it from me, but I lay it down of my own accord. I have authority to lay it down, and I have authority to take it up again. This charge I have received from my Father.” – John 10:17-18
And his willingness stretched far beyond a voluntary death on the cross. Rather, his entire life was an offering, lived in willing obedience to God.
This was not the case for this sheep. Though initially in hand, it wriggled, wrangled and avoided capture long enough for more than a little color to come to our hosts’ face. In the end however, the pen provided only so many options for evasion.