Acts 16:30-32 30And brought them out, and said, Sirs, what must I do to be saved? 31And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house. 32And they spake unto him the word of the Lord, and to all that were in his house. Many of them who teach salvation by works use this passage as proof text that believing is a condition man meets to get saved, when this text teaches no such thing, its just careless teaching of this text that comes to that erroneous conclusion ! Paul told the Jailor, who inquired " What must I DO to be saved" Believe on the Lord Jesus Christ and thou shalt be saved, and thy house. BTW, since Paul added "and your house" it is very unlikely that Paul understood the Jailor to be inquiring about anything but soul salvation, and not being saved from roman government reprisal as many have conjectured; and after that it is stated in vs 32 which almost everyone neglects to mention and consider when they run to vs 30-31 for proof text," and they spake unto him the word of the Lord and all in his house" [which is the Gospel] Now this is a important statement in order to understand vs 31, because how could one believe on the Lord Jesus Christ without knowing some facts about Him ? Is merely believing the historical facts about Christ as Per 1 Cor 15:3-4, is that what believing on or in Christ ? Absolutely not ! So thats why it is important to first preach the word of the Lord to one [as Paul and His associate did] before they can believe on the Lord. No one can just believe on the Lord Jesus Christ unless to them certain facts about Him are made known unto that person !