'Itself' in the Bible

I tell you the solemn truth, unless a kernel of wheat falls into the ground and dies, it remains by itself alone. But if it dies, it produces much grain.

Remain in me, and I will remain in you. Just as the branch cannot bear fruit by itself, unless it remains in the vine, so neither can you unless you remain in me.

and the face cloth, which had been around Jesus' head, not lying with the strips of linen cloth but rolled up in a place by itself.