Acts 17:11 11 These were more [d]fair-minded than those in Thessalonica, in that they received the word with all readiness, and searched the Scriptures daily to find out whether these things were so
–It doesn’t say they searched man’s words or teachings to see if what Paul was preaching was true, they searched the Scripture.
But they first heard the gospel as orally revealed by Paul a man. Paul was a Jewish scholar and student of Gamiel an OT scholar. Yet Paul didn’t understand the OT correctly. He was on his way to Damascus to arrest Christians where Christ revealed true understanding. Then Paul went to the desert of Arabia for three years, probably to rethink his OT theology in the light of Christ’s revelation.
The Jewish [/b]Bereans[/b], had only Old Testament scriptures in their time. The Bereans should have or already knew the OT well, as most Jews did. Yet they only had a true understing of the OT, after Paul preached, in the light of what Christ revealed. Then they searched the scriptures (OT) in the light of the Gospel, to see if those things, not seen or understood before, were so.
God did not reveal everything at once, but over centuries, gradually unveiling a deeper understanding of those trues, giving a clearer picture, with the final revelations through Christ. The interpretative remarks of the Amplified Bible buts is very well,
[Hb1:1 In many separate revelations [each of which set forth a portion of the Truth] and in different ways God spoke of old to [our] forefathers in and by the prophets, 2 [But] in the last of these days He has spoken to us in [the person of a] Son,…]
The early fathers of the Church teach, the NT is hidden in the Old and the OT is revealed in the New.
Luke 24:26-27 26 Ought not the Christ to have suffered these things and to enter into His glory?” 27 And beginning at Moses and all the Prophets, He [g]expounded to them in all the Scriptures the things concerning Himself.
–Even Christ is saying the way to know about Him is through the Scripture because that is were you will find the things concerning Him and by extension if you know Christ then you know His will for the church and His people.
Know he didn’t say the only way to know him was scripture as they had the OT already. Same as with the Bereans they didn’t understand OT properly till Christ, who they though was some man, gave them orally the gospel. They didn’t even recognize him till the breaking of bread.