The disciples had almost forgotten about the
Holy Spirit and Jesus had to remind them.

"And I will pray the Father, and he shall give
you another Comforter, that he may abide
with you for ever; Even the Spirit of truth;
whom the world cannot receive, because it
seeth him not, neither knoweth him; but ye
know him; for he dwelleth with you, and
shall be in you. I will not leave you confort-
less: I will come to you" John 14:16-18