This from John Calvin’s Commentary (which was really a series of lectures compiled) on the Book of Daniel, Chapter 1, Verse 4:

“Meanwhile, we observe, that learning and the liberal arts were not then so despised as they are in this age, and in those immediately preceding it. So strongly has barbarism prevailed in the world, that it is almost disgraceful for nobles to be reckoned among the men of education and of letters! The chief boast of the nobility was to be destitute of scholarship — nay, they gloried in the assertion, that they were “no scholars,” in the language of the day; and if any of their rank were versed in literature, they acquired their attainments for no other purpose than to be made bishops and abbots’ still, as I have said, they generally despised all literature. We perceive the age in which Daniel lived was not so barbarous, for the king wished to have these boys whom he caused to be so instructed, among his own princes, as we have said, to promote his own advantage; still we must remark upon the habit of that age. As to his requiring so much knowledge and skill, it may seem out of place, and more than their tender age admitted, that they should be so accomplished in prudence, knowledge, and experience. But we know that kings require nothing in moderation when they order anything to be prepared, they often ascend beyond the clouds. So Nebuchadnezzar speaks here; and Daniel, who relates his commands, does so in a royal manner. Since the king commanded all the most accomplished to be brought before him, if they really manifested any remarkable qualities, we need not be surprised at their knowledge, skill, and prudence. The king simply wished those boys and youths to be brought to him who were ingenious and dangerous, and adapted to learn with rapidly; and then those who were naturally eloquent and of a healthy constitution of body. For it follows directly, that they might learn, or be taught the literature and language of the Chaldees We perceive that King Nebuchadnezzar did not demand teachers, but boys of high birth, and good talents, and of promising abilities; he wished them to be liberally instructed in the doctrine of the Chaldees he was unwilling to have youths of merely polished and cultivated minds without natural abilities.