Be thou children

"Truly I say to you, unless you are converted and become like children, you shall not enter the kingdom of heave. Whoever therefore shall humble himself as this child, the same is greatest in the kingdom of heaven."
Matthew 18:3-4

"Jesus said, 'From Adam to John the Baptist, among those born of women, no one is so much greater than John the Baptist that his eyes should not be averted. But I have said that whoever among you becomes a child will recognize the (Father's) imperial rule and will become greater than John.'"
Gospel of Thomas, Logion 46

"The child is Father of the Man. ... The things which I have seen [as a child] I now can see no more. Our birth is but a sleep and a forgetting. ... Heaven lies about us in our infancy! Shades of the prison-house begin to close upon the growing boy."
William Wordsworth, Ode: Intimations of Immortality from Recollections of Early Childhood.

Humble as a child. Children come into this world with no ego, no sense of an earthly self. As one grows, that sense of self attached to this world grows stronger and stronger or, as Wordsworth so eloquently stated: "Shades of the prison-house begin to close upon the growing boy." "Prison-house" = our earthly existence. How does one escape the prison? To humble oneself as a child, slay the beast that is our earthly ego.