{6} Then Simon himself believed also: and when he was baptized, he continued with Philip, and wondered, beholding the miracles and signs which were done.

(6) The wicked and the highly reprobate are often forced to taste the good gift of God, but they immediately spit it out again.

People's New Testament

8:13 Then Simon himself believed also. There has been much needless discussion whether Simon was sincere. It would never have been doubted had we not been told that later he fell into sin. It is best to take the Scripture in its manifest sense. He became a believer like the rest. He was baptized like the rest; then, like many others, at a later period, under temptation, he fell into sin. It is impossible to believe that a man of his power and influence in Samaria would have yielded outwardly to the gospel and shown the deference he manifested to Philip unless he was at the time sincere. But he was of the class described by the Savior when the seed of the sower fell among among thorns (Mt 13:22 Mr 4:18,19).

Wesley's Notes

8:13 And Simon believed - That is, was convinced of the truth.

King James Translators' Notes

miracles...: Gr. signs and great miracles

Jamieson-Fausset-Brown Bible Commentary

13. Then Simon himself believed also-Left without followers, he thinks it best to join the man who had fairly outstripped him, not without a touch of real conviction.

and . was baptized-What a light does this throw on what is called Baptismal Regeneration!

he continued with Philip-"was in constant attendance upon" him.

Matthew Henry's Concise Commentary

8:5-13 As far as the gospel prevails, evil spirits are dislodged, particularly unclean spirits. All inclinations to the lusts of the flesh which war against the soul are such. Distempers are here named, the most difficult to be cured by the course of nature, and most expressive of the disease of sin. Pride, ambition, and desire after grandeur have always caused abundance of mischief, both to the world and to the church. The people said of Simon, This man is the great power of God. See how ignorant and thoughtless people mistake. But how strong is the power of Divine grace, by which they were brought to Christ, who is Truth itself! The people not only gave heed to what Philip said, but were fully convinced that it was of God, and not of men, and gave up themselves to be directed thereby. Even bad men, and those whose hearts still go after covetousness, may come before God as his people come, and for a time continue with them. And many wonder at the proofs of Divine truths, who never experience their power. The gospel preached may have a common operation upon a soul, where it never produced inward holiness. All are not savingly converted who profess to believe the gospel.