Luke 17:20

And when He was demanded of the Pharisees. The Kingdom of Israel, which had now indeed fallen, but which was to be raised up again by the Messiah.

The kingdom of God cometh not with observation. "Cometh," that is, will come. It is a Hebraism, in which the present is put for the future. Observe that Christ said, "Repent, for the kingdom of God is at hand." This Pharisee, therefore, either from a desire of knowledge, or to mock Jesus, said, "Thou Jesus preachest Thy kingdom in heaven, but when will it come? When shall we see Thee reigning in it? When shall we see Israel, who is now subjugated by the Romans, breathe again through Thy means and recover her liberty and live happily under Thee as her kin?" "They asked Him when He would reign," says Euthymius, "as to deride Him, who appeared as one of low estate." But Christ answered mildly and briefly at first as in this verse, but afterwards at more length (verse 22 to the end of the chapter). He spoke of the glory of His kingdom in the heavens, to which that of grace should first be subordinated on earth, for we proceed to glory through grace. He said therefore,

The kingdom of God. The kingdom of God and the Messiah cometh not with previous preparation, nor with the outward pomp of soldiers, horses, and chariots, as you can see, from itself. You know a king to be at hand when you see his attendants preceding him. With such as these you thought that the kingdom of the Messiah would come, and you look for it as now nigh at hand. Ver.21. Neither shall they say. They shall not say, In Jerusalem is the royal throne of Christ, He reigns there in magnificence like another Solomon; because Christ does not reign on a bodily throne, but in a spiritual soul, which by His grace He rules and directs into all good, and so guides it to the kingdom of heaven. For the kingdom of God is not meat and drink but righteousness, and peace, and joy in the Holy Ghost, Romans 14:17. I would understand all these sayings of the same thing: that is, of the first Advent of Christ in which He reigns in the souls of the faithful as a king through His grace; for thus do His sayings, as a whole, best agree together and cohere. Some, however, understand the kingdom of glory, because He will adorn even the bodies of the just with His own brightness, and other gifts, as all may see.

Secondly, This kingdom of God is within us: that is, it is in our own power if we embrace the faith and grace of Christ, and work with Him, for, as Titus says, "It is of our own will and power to receive the kingdom of God."

Thirdly, The kingdom of God is within us, because Christ, as our God and king, lives among us preaching and endowing this kingdom. Thus speaks Theophylact: "The kingdom of God on the whole is to live after the manner of the angels, when nothing of this world occupies our souls. We need no long time and no distant journey, for faith is near us, and after faith the divine life." The same also said the Apostle, "The word is nigh thee, in thy mouth and in thy heart, that is, the word of faith," Rom. x. 8. For to believe, and to walk worthily of our belief and of our calling, is within us. The Pharisees therefore derided the Lord, but He turned them into ridicule, showing that they were ignorant of that which was within them and which is very easy to any one who wishes for it. "For now when I am in the midst of you, you are able to possess the kingdom of God if you believe in Me and will live according to My commandments."