which is it, "Spirit will guide" or the "Bible alone" because you present these as two fundamental sources of truth.
The Spirit guides a person into all truth by the Scriptures:
The statement, "
Howbeit when he, the Spirit of truth, is come, he will guide you into all truth" is a part of inspired Scripture (John 16:13). We would not know about this truth unless Scripture stated it. Also, Scripture is inspired by God (2 Timothy 3:16). Jesus says to the Father, "
your word is truth." (John 17:17). Jesus spoke what the Father told Him to say and to do (John 12:49) (John 8:28) (John 8:29).
In all Jesus' teachings He referred to the divine authority of the Old Testament (Matthew 5:17-18; Matthew 8:17;Matthew 12:40-42; Luke 4:18-21; Luke 10:25-28; Luke 15:29-31; Luke 17:32; Luke 24:25-45; John 5:39-47). He quoted the Old Testament 78 times, the Pentateuch alone 26 times. He quoted from Genesis, Exodus, Leviticus, Deuteronomy, Psalms, Proverbs, Isaiah, Jeremiah, Ezekiel, Daniel, Hosea, Amos, Jonah, Micah, and Malachi. He referred to the Old Testament as “The Scriptures,” “the word of God,” and “the wisdom of God.” Jesus defeated the devil by using Scripture. For three words, "It is written" was said 3 times by Jesus in Matthew 4:1-11. This is confirmed by Ephesians 6 with how the Sword of the Spirit is the Word of God which is a part of putting on the armor of God so that one can stand against the wiles of the devil (Ephesians 6:11, Ephesians 6:16).
"Man shall not live by bread alone, but by every word that proceeds out of the mouth of God." (Matthew 4:4).
Paul said that what He had written should be regarded as the Lord's commandments (1 Corinthians 14:37). Luke sets out an order of declaration amongst the ministers of the Word to write out the events in order to Theophilus so that he might know for certain of the truth (on Christ's teachings) which he had been instructed.
Luke 1:1-4
"Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us, Even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word; It seemed good to me also, having had perfect understanding of all things from the very first, to write unto thee in order, most excellent Theophilus, That thou mightest know the certainty of those things, wherein thou hast been instructed."
Paul's writings were regarded as Scripture.
"As also in all
his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as
they do also the other scriptures, unto their own destruction." (2 Peter 3:16).
John's Gospel is sufficient alone for saving faith in Jesus Christ.
What is purpose of John's book or gospel?
John 20:30-31 says,
"And many other signs truly did Jesus in the presence of his disciples, which are not written in this book: But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name."
Did you catch that? It essentially says these things (Within the book of John) are written, that ye might believe that Jesus is the Christ and that we might have life (eternal life) through his name. In other words, a person can receive eternal life or salvation in Jesus Christ by reading the book of John. This is the "Written of God." In other words, this shows that the "Written Word of God" alone is sufficient to bring us to saving faith in God.
For without the Bible, a person opens themselves up to deception and or another Christ. The Bible gives us ways so as to guide us spiritually and so as to obey the Lord properly.