43 How great is the importance of childhood and adolescence in this absolute universality and totality of the divine mandate to the Church, has been shown by the Divine Master Himself, the Creator and Redeemer of souls, by His example and particularly by those memorable words which are also so formidable: "Suffer the little children and forbid them not to come to Me . . . who believe in Me, for theirs is the Kingdom of Heaven. . . whose angels always behold the face of the Father who is in Heaven. Woe to that man who shall scandalize one of these little ones!" ( Math . xix, 13; xviii, 1, et seq).
Source: Non Abbiamo Bisogno (Vatican.va)