"Let the little children come to Me,and do not forbid them; for of such is the kingdom of God. Assuredly I say to you, whoever does not receive the kingdom of God as a little child will by no means enter it"
It is necessary, however, to examine what is the meaning of being babes in wickedness, and how a man becomes so, while in mind a grown man. A babe then, as knowing either very little or nothing at all, is justly acquitted of the charge of depravity and wickedness; and so it is also our duty to endeavor to be like them in the very same way, by putting habits of wickedness entirely away from us, so we too may be regarded as men who do not even know the pathway leading to guile, but who, unconscious of malice and fraud, live in a simple manner, practicing gentleness and a priceless humility, and readily forbearing from wrath and spitefulness. For such we affirm are the qualities found in those who are still babes.
(St Cyril of Alexandria. Commentary on the Gospel of St. Luke, Homily #121.)
"Create in me a clean heart, O God, and renew a right spirit within me. Cast me not away from Thy presence and take not Thy Holy Spirit from me. Restore unto me the joy of Thy salvation and with Thy governing Spirit establish me." (Ps 50)