For the surname, great power, tendeth to this end, that whatsoever should otherwise be divine might wax vile through this greatness. Therefore the power of Christ appeareth hereby more plainly, in that Philip brake through these lets; which thing Luke amplifieth,

The great power of God - Probably this means only that they believed that he was "invested with" the power of God, not that they supposed he was really the Great God.

This man is the great power of God - That is, he is invested with it, and can command and use it. They certainly did not believe him to be God; but they thought him to be endued with a great supernatural power.
There is a remarkable reading here in several MSS. which should not pass unnoticed. In ABCDE, several others, together with the Ethiopic, Armenian, later Syriac, Vulgate, Itala, Origen, and Irenaeus, the word καλουμενη is added before μεγαλη, and the passage reads thus, This person is that power of God which is Called the Great. This appears to be the true reading; but what the Samaritans meant by that power of God which they termed the Great, we know not. Simon endeavored to persuade the people that he was a very great personage, and he succeeded.

To whom they all gave heed,.... Were not only attentive to the strange things he did, and to the wonderful things he gave out concerning himself; but they believed what he said and did as real things, and were obedient to him: and that
from the least to the greatest; which does not so much respect age, though the Ethiopic version renders it, "from the younger of them to the eldest of them", as state and condition; persons of every rank and quality, high and low, rich and poor, magistrates and subjects, from the meanest to the greatest of them; and so the Syriac version renders it, "both great", or "noble, and mean"; he drew the attention, and commanded the regard, both of princes and peasants, of the learned and unlearned, of the great men, and of the common people, who one and all wondered at him, and applauded him:
saying, this man is the great power of God; or as the Alexandrian copy and some others, and the Vulgate Latin version read, "this is the power of God which is called great"; they took him for the supreme Deity, or as Justin Martyr (h) expresses it, they accounted him the first, or chief God, or they looked upon him to be the Messiah, "the great power of God": as the Syriac version renders it; and who should be great, and called the Son of the Highest, Luke 1:32.
(h) Ut supra. (Apolg. 2. p. 69.)

To whom all gave heed . . . because of long time he had bewitched them--This, coupled with the rapidity with which they deserted him and attached themselves to Philip, shows the ripeness of Samaria for some religious change.

This man is the great power of God. Unable to explain the things that he did, the Samaritans ascribed them to divine power manifested through Simon.