Jesus answered and said unto them, Ye do err, not knowing the scriptures, nor the power of God. - Matthew 22:29
The former is a result of the latter. There is no saving knowledge of God and his Christ apart from the Word of God revealed. Although one may read the Scriptures and hear the Gospel preached, Christ is only known by divine revelation. All error springs from not knowing the scriptures, nor the power of God. The Lord Jesus Christ, who is the power of God, and the wisdom of God (1 Cor 1:24), is the sum and substance of all Scripture. Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me (Jn 5:39). The first words of Scripture, In the beginning God, and the last words of the Bible, The grace of our Lord Jesus Christ be with you all, speak of Him.
The preaching of Christ is the power of God unto salvation to everyone that believeth and 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 (Jn 20:31). There must be spiritual life to KNOW the Word of God and the power of God because the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know [them], because they are spiritually discerned (1 Cor 2:14). Spiritual ignorance of not knowing the Scriptures always results in error and in a theoretical or abstract conception of Christ. There can be no faith in Christ without knowing Him; there can be no knowing him apart from the Scriptures. There can be no knowing the Scriptures without spiritual life, and there can be no life apart from a work of almighty grace.