From the Gospel of Thomas:
3) Jesus said, "If those who attract you say, 'See, the Kingdom is
in the sky,' then the birds of the sky will precede you. If they
say to you, 'It is under the earth,' then the fish of the sea will
precede you. Rather, the Kingdom of God is inside of you, and it is
outside of you. [Those who] become acquainted with [themselves]
will find it; [and when you] become acquainted with yourselves, [you
will understand that] it is you who are the sons of the living
Father. But if you will not know yourselves, you dwell in poverty
and it is you who are that poverty."
108) Jesus said, "He who will drink from my mouth will become
like Me. I myself shall become he, and the things that are hidden
will become revealed to him."
113) His disciples said to Him, "When will the Kingdom come?"
<Jesus said,> "It will not come by waiting for it. It will
not be a matter of saying 'Here it is' or 'There it is.' Rather,
the Kingdom of the Father is spread out upon the earth, and men
do not see it."