The question of paying the tax has several aspects. On the one hand, there is the purely historical and legal aspect, for which modern exegesis offers several interpretations: it may have been...
The question of paying the tax has several aspects. On the one hand, there is the purely historical and legal aspect, for which modern exegesis offers several interpretations: it may have been the Temple tax established by the Law of Moses, or it may have been a Roman tax, as many Fathers of the Church believed. On the other hand, it is also a spiritual question. We have a firm conception of justice, of what is right and what is not, but we must consider this from an eschatological perspective. Here, within earthly reality, people's concrete needs are more important.
The Lord also shows us how to find the means to meet those needs: earn them through our own labour. A miracle certainly took place here, but Peter was a fisherman; he had to go and cast his line—that is, do his ordinary work—and only then did the miracle happen.
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18:1 Who is the greatest in the kingdom of heaven? - Which of us shall be thy prime minister? They still dreamed of a temporal kingdom.
18:2 And Jesus calling to him a little child - This is supposed to have been the great Ignatius, whom Trajan, the wise, the good Emperor Trajan, condemned to be cast to the wild beasts at Rome! Mar 9:36; Luk 9:47.
18:3 Except ye be converted - The first step toward entering into the kingdom of grace, is to become as little children: lowly in heart, knowing yourselves utterly ignorant and helpless, and hanging wholly on your Father who is in heaven, for a supply of all your wants. We may farther assert, (though it is doubtful whether this text implies so much,) except ye be turned from darkness to light, and from the power of Satan to God:, except ye be entirely, inwardly changed, renewed in the image of God, ye cannot enter into the kingdom of glory. Thus must every man be converted in this life, or he can never enter into life eternal.Ye shall in no wise enter - So far from being great in it. Mat 19:14.
18:5 And all who are in this sense little children are unspeakably dear to me. Therefore help them all you can, as if it were myself in person, and see that ye offend them not; that is, that ye turn them not out of the right way, neither hinder them in it. Mat 10:40; Luk 10:16; Joh 13:20.