Origen
Catena Aurea · Matthäusevangelium 18
Take heed that ye despise not one of these little ones; for I say unto you, That in heaven their angels do always behold the face of my Father which is in heaven. For the Son of man is come to save that which was lost. How think ye? if a man have an hundred sheep, and one of them be gone astray, doth he not leave the ninety and nine, and goeth into the mountains, and seeketh that which is gone astray? And if so be that he find it, verily I say unto you, he rejoiceth more of that sheep, than of the ninety and nine which went not astray. Even so it is not the will of your Father which is in heaven, that one of these little ones should perish.
The little ones are those that are but lately born in Christ, or those who abide without advance, as though lately born. But Christ judged it needless to give command concerning not despising the more perfect believers, but concerning the little ones, as He had said above, If any man shall offend one of these little ones. A man may perhaps say that a little one here means a perfect Christian, according to that He says elsewhere, Whoso is least among you, he shall be great. (Luke 9:48.)