Cyril of Alexandria
Catena Aurea · Lukasevangelium 17
Lk 17, Verses 20–21English original
And when he was demanded of the Pharisees, when the kingdom of God should come, he answered them and said, The kingdom of God cometh not with observation: Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you.
Now it is only for the benefit of each individual that He says that which follows, For behold the kingdom of God is within you; that is, it rests with you and your own hearts to receive it. For every man who is justified by faith and the grace of God, and adorned with virtues, may obtain the kingdom of heaven.