Paul noted in Romans 3 by quoting that "The Lord has looked down from heaven upon the sons of men, to see if there are any who understand, who seek after God" (Ps 14:2). Why does Christ seek the lost? It is because no one seeks on their own since "every one of them has turned aside; together they have become corrupt" (Ps 53:3). Paul elaborates in Romans 10 by citing "I permitted Myself to be sought by those who did not ask for Me; I permitted Myself to be found by those who did not seek Me" (Isa 65:1). Paul asks "how shall they hear" (Ro 10:14) without anyone telling them? He also asks "surely they have never heard, have they?" (:17). But he affirms the promulgation of doctrine in Romans 10 by quoting "their line has gone out through all the earth, and their utterances to the end of the world" (Isa 19:4). However Isaiah asks, "Who has believed our message?" (53:1). Paul then presents the caveat that "a natural man does not accept the things of the Spirit of God; for they are foolishness to him, and he cannot understand them, because they are spiritually appraised" (1Co 2:14). If you need the Spirit to comprehend scripture, but don't have the Spirit because you haven't experienced salvation, then it is a "catch-22" and you need a way to comprehend the gospel initially. Paul said he was "not ashamed of the gospel, for it is the power of God for salvation to every one who believes" (Ro 1:16). Scriptures "have been written that you may believe that Jesus is the Christ" (Jn 20:31). It is "the message of truth, the gospel of your salvation" (Eph 1:13) and the "living and enduring word of God" (1Pe 1:23). "All scripture is inspired by God" (2Ti 3:16) and "if any man is willing to do His will, he shall know of the teaching whether it is of God" (Jn 7:17). It is revelation by "faith which comes by hearing, and hearing by the word of Christ" (Ro 10:17). The Greek word rhema defines it as the Living Word of God himself speaking. Jesus told Peter "'flesh and blood did not reveal this to you, but My Father who is in heaven'" (Mt 1:17).
Not only did God perform works, but he personally made things known to his servants which got recorded in scripture. It is estimated that one-third of scriptures are prophetic and two thousand prophecies have already been fulfilled. Jesus, himself, quoted fifteen Old Testament books. He prefaced a quote of Deuteronomy 8:3 by answering, "'It is written'" (Lk 4:4). He substantiates the Old Testament because "He was teaching them as one having authority" (Mt 7:29). He had this authority as exemplified by his using "'But I say'" (Mt 5:33,28,32,34,39,44) six times in the Sermon on the Mount. He deferred to the Bible as when he said "'have you not read that which was spoken to you by God'" (Mt 22:31) when quoting Exodus 3:6. God was speaking to Moses from a burning bush. But Jesus said he had spoken "to you" and didn't treat it as a second-hand reference. His dialog was with people "'not understanding the scriptures'" (:29). Another time he asked them, "'Why do you yourselves transgress the commandment of God?'" (Mt 15:3). He said, "'You invalidated the word of God'" (:6) in referring to the Fourth Commandment (Ex 20:12). Jesus states that "'Scripture cannot be broken'" (Jn 10:35) and you shouldn't ever break "'the least of these commandments'" (Mt 5:19).
Paul said "all Scripture is inspired by God" (2Ti 3:16) and Peter said that prophecy came by men who "spoke from God" (2Pe 1:21). God told Moses he would "teach you what you are to say" (Ex 4:12) and told Jeremiah "all that I command you, you shall speak" (Jer 1:7). Peter said "Paul, according to the wisdom given him, wrote to you" (2Pe 3:15). Paul concurs saying "the things which I write to you are the Lord's commandment" (1Co 14:37) and "taught by the Spirit" (2:13). He told the Ephesians he had declared the "whole purpose of God" (Ac 20:27). In TV detective shows they often mention the "chain of evidence." Jesus followed the same "standard operating procedure" as Peter and Paul. Jesus explained, "'the Father Himself who sent Me has given Me commandment, what to say, and what to speak'" (Jn 12:49). He also said the Spirit "'will bear witness of Me'" (15:26) but "'will not speak on His own initiative, but whatever He hears, He will speak'" (16:13). Furthermore "'the Holy Spirit . . . will teach you all things, and bring to your remembrance all that I said to you'" (14:26). Therefore you will "'know of the teaching, whether it is of God, or whether I speak from Myself'" (7:7).