John 16:32
“The Father is with Me.”
He has again put on their account; for this they everywhere wished to learn. Then, to show that He did not give them perfect knowledge by saying this, but in order that their reason might not rebel, (for it was probable that they might form some human ideas, and think that they should not enjoy any assistance from Him,) He says,
Source: Homilies on the Gospel of John (New Advent)