John Chrysostom — as excerpted in the Catena Aurea on Matthew 21:10-16

“This was at once a type of the Gentiles, and no small comfort to the Apostles; for that they might not be perplexed, contriving how having no education for the purpose they should preach the Gospel, these children going before them did away that fear; for He who made these to sing His praises, shall give speech to those. This miracle also shews that Christ was the Framer of nature; seeing the children spoke things full of meaning, and agreeing with the Prophets, whereas the men uttered things meaningless, and full of frenzy.”