Began at the same scripture - He did not confine himself to this one scripture, but made this his text, and showed, from the general tenor of the sacred writings, that Jesus was the Christ, or Messiah; and that in his person, birth, life, doctrine, miracles, passion, death, and resurrection, the Scriptures of the Old Testament were fulfilled. This preaching had the desired effect, for the eunuch was convinced of the truth of Philip's doctrine, and desired to be baptized in the name of Jesus.

opened.

Acts 10:34 Then Peter opened his mouth, and said, Of a truth I perceive that God is no respecter of persons:

Matthew 5:2 And he opened his mouth, and taught them, saying,

2 Corinthians 6:11 O you Corinthians, our mouth is open to you, our heart is enlarged.

began.

Acts 18:28 For he mightily convinced the Jews, and that publicly, showing by the scriptures that Jesus was Christ.

Acts 26:22,23 Having therefore obtained help of God, I continue to this day, witnessing both to small and great...

Acts 28:23 And when they had appointed him a day, there came many to him into his lodging; to whom he expounded and testified the kingdom of God...

Luke 24:27,44-47 And beginning at Moses and all the prophets, he expounded to them in all the scriptures the things concerning himself...

preached.

Acts 3:20 And he shall send Jesus Christ, which before was preached to you:

Acts 9:20 And straightway he preached Christ in the synagogues, that he is the Son of God.

Acts 11:20 And some of them were men of Cyprus and Cyrene, which, when they were come to Antioch, spoke to the Grecians, preaching the LORD Jesus.

Acts 17:3,18 Opening and alleging, that Christ must needs have suffered, and risen again from the dead; and that this Jesus, whom I preach to you...

Acts 19:13 Then certain of the vagabond Jews, exorcists, took on them to call over them which had evil spirits the name of the LORD Jesus, saying...

1 Corinthians 1:23 But we preach Christ crucified, to the Jews a stumbling block, and to the Greeks foolishness;

1 Corinthians 2:2 For I determined not to know any thing among you, save Jesus Christ, and him crucified.

Ephesians 4:21 If so be that you have heard him, and have been taught by him, as the truth is in Jesus:

1 Peter 1:11,12 Searching what, or what manner of time the Spirit of Christ which was in them did signify...

A Meeting in the Desert
'And the angel of the Lord spake unto Philip, saying, Arise, and go toward the south unto the way that goeth down from Jerusalem unto Gaza, which is desert. 27. And he arose and went: and, behold, a man of Ethiopia, an eunuch of great authority under Candace queen of the Ethiopians, who had the charge of all her treasure, and had come to Jerusalem for to worship, 28. Was returning, and sitting in his chariot, read Esaias the prophet. 29. Then the Spirit said unto Philip, Go near, and join thyself …
Alexander Maclaren—Expositions of Holy Scripture: The Acts

Whether the Imposition of the Priest's Hands is Necessary for this Sacrament?
Objection 1: It would seem that the imposition of the priest's hands is necessary for this sacrament. For it is written (Mk. 16:18): "They shall lay hands upon the sick, and they shall recover." Now sinners are sick spiritually, and obtain recovery through this sacrament. Therefore an imposition of hands should be made in this sacrament. Objection 2: Further, in this sacrament man regains the Holy Ghost Whom he had lost, wherefore it is said in the person of the penitent (Ps. 1:14): "Restore unto …
Saint Thomas Aquinas—Summa Theologica

Whether Penance is a Sacrament?
Objection 1: It would seem that Penance is not a sacrament. For Gregory [*Cf. Isidore, Etym. vi, ch. 19] says: "The sacraments are Baptism, Chrism, and the Body and Blood of Christ; which are called sacraments because under the veil of corporeal things the Divine power works out salvation in a hidden manner." But this does not happen in Penance, because therein corporeal things are not employed that, under them, the power of God may work our salvation. Therefore Penance is not a sacrament. Objection …
Saint Thomas Aquinas—Summa Theologica