5:22 But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faith,
5:23 gentleness, and self-control. Against such things there is no law.
5:24 Those who belong to Christ have crucified the flesh with its passions and lusts.
Origins and Sources of the Gospel of Barnabas, John Gilchrist
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While there is an historic rationale for the formation of the Bible canon, the certainty that the 66 books are the only documents inspired by God is based upon the fact that he is faithful in preserving his word for his people.