Cyrill of Alexandria
What lacks Christ is unsuitable for sacrifice and flawed, while what is pleasing and profoundly sacred through Him is evident from the law stated in Exodus, “Thou shalt not boil a kid in its mother's milk,” and in Leviticus: “And the Lord spoke unto Moses, saying, When a calf, or a lamb, or a goat is born, it shall remain seven days with its mother; and from the eighth day onward it shall be acceptable for an offering unto the Lord: but thou shalt not slaughter either cow or sheep in one day” (Lev. 22:26-28). The newborn lamb, which is still nursing, cannot be sacrificed, illustrating that what is imperfect and seemingly fragile in intellect and strength has not yet attained holiness, and thus is unwelcome before God.
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Some individuals, lacking wisdom and discernment, are the recipients of Paul's divine message: “For judging from the time, you ought to be teachers; but you must be taught again the first principles of the word of God, and you need milk, and not solid food. Anyone who feeds on milk is ignorant of the word of truth, because he is a babe; but solid food is peculiar to the perfect” (Heb. 5:12-14). Therefore, still dependent on milk and the nurture of others, I refer to spiritual understanding and maturity.