John 16:12
“I have yet many things to say unto you, but you cannot bear them now.”
“Therefore it is expedient for you that I depart, if you then will bear them when I departed.” “And what has come to pass? Is the Spirit greater than You, that now indeed we bear not, but It will fit us to bear? Is It working more powerful and more perfect?” “Not so; for He too shall speak My words.” Wherefore He says,
Source: Homilies on the Gospel of John (New Advent)