What Must I Do To Be Saved?

Pondering upon this verse:

Act 16:30  And brought them out, and said, Sirs, what must I do to be saved? 

John Gill's commentary on the verse:

And brought them out,.... Of the inner prison, to some part of the prison that was more free and open: 

and said, Sirs, what must I do to be saved? he treats them with great reverence now, and addresses them under a title and character of honour and respect; whom but a few hours ago he despised and abhorred, and perhaps knew no name bad enough for them; he now saw himself lost and perishing, and wanted their instructions, advice, and assistance; and as most persons under first awakenings are, so he was, upon the foot of works; thinking he must do something to procure his salvation, and desires to know what it was he must do, that he might set about it directly; and it may be he had heard what the damsel possessed with a spirit of divination had frequently said of Paul and Silas, that they were the servants of the most high God, and showed unto men the way of salvation, Act_16:17 and therefore he desires that they would acquaint him with it: his language shows, he was in earnest, and expresses great eagerness, importunity, and haste.

Act 16:31  And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.

And they said, believe in the Lord Jesus Christ,.... Not with a bare historical faith, as only to believe that he was the Son of God, and the Messiah, and that he was come in the flesh, and had suffered, and died, and rose again, and was now in heaven at the right hand of God, and would come again to judge both quick and dead, for there may be such a faith and no salvation; but so as to look unto him alone for life and salvation, to rely upon him, and trust in him; to commit himself, and the care of his immortal soul unto him, and to expect peace, pardon, righteousness, and eternal life from him; the answer is much the same our Lord returned to the Jews, when they asked, though not with the same affection and sincerity as this man, what they must do to work the works of God, John 6:28. 

And thou shalt be saved; from sin, and all its miserable effects and consequences; from the curses of the law, from the power of Satan, from the evil of the world, from the wrath of God, hell and damnation: this is to be understood of a spiritual and eternal salvation; for it is said, after that the jailer was inquiring about it, being terrified in his conscience with a sense of sin and wrath; and between believing in Christ, and being saved with an everlasting salvation, there is a strict and inseparable connection, Mark 16:16 though not faith, but Christ is the cause and author of salvation; faith spies salvation in Christ, goes to him for it, receives it from him, and believes unto it: 

and thy house; or family, provided they believe in Christ also, as they did, Acts 16:34 or otherwise there can be no salvation, for he that believeth not shall be damned.