The following information comes from the book, The People Called Methodists: The Heritage, Life and Mission of The Methodist Church in Singapore, which identifies John Wesley’s high regard for Scripture.
Methodists share with other Christians the affirmation that Scripture is the primary source and criterion for Christian doctrine and theology. It is normative  our rule. Our doctrinal standards affirm the Bible as the source of all that is necessary and sufficient unto salvation (Articles of Religion). We recognise the whole Bible, 39 books of the Old Testament and 27 books of the New Testament.
John Wesley continues to be our guide in many ways. He referred to himself as a man of one book, (homo unius libri), Holy Scripture. In total agreement with the sixteenth century Reformers, he maintained that Scripture is the source and standard of Christian doctrine and conduct, whose authority is final, and can never be superseded.
For Wesley, Scripture is the infallible revelation of God. He affirmed that the biblical writers were inspired, as were the words that they wrote, so that these words are the very words of God, through which God continues to speak. He linked infallibility to authority because he firmly believed that Scripture is the Word of God: true, perfect and consistent.
Nevertheless, Wesley was not an inerrantist in the contemporary sense of the term, with its preoccupation with details. An 18th century man, he lived at a time when the scepticism of enlightenment, anti-authoritarianism and critical methods of study, were sweeping Europe. Yet Wesley upheld the divine authority of Scripture, the source and norm of Christian doctrine.
Wesley not only embraced the Reformers’ principle of Scripture alone (sola scriptura), but also embraced their belief that the Bible must be studied as a whole. Adopting a canonical approach to interpreting scripture as the Reformers did, he believed that one should interpret Scripture with Scripture. Because Scripture is a whole, the parts can be harmonised with one another, and the Bible can interpret itself.
Through Scripture we know of God’s wonderful grace and the history of God’s saving acts. We can read of God’s sovereignty and love in the unfolding acts of creation, of the tragic sinfulness of humanity, of God’s yearning to redeem his fallen creation through covenants and finally through a changed heart. It is in Scripture that we meet the living Jesus Christ, the Son of God, our Saviour, crucified and risen  the way of salvation. Through Scripture the Holy Spirit is able to lead each individual to a saving knowledge of Jesus Christ.
Our reading of Scripture tells us not only the way of salvation but also how we ought to live in the world. Scripture must be read and interpreted within the community of believers, informed by the tradition of that community, aided by scholarly inquiry and personal insight, and guided by the Holy Spirit. Interpretation always involves an understanding of our Christian tradition, a living Christian experience, and reason. Guided by the Holy Spirit, they can become creative instruments to open our eyes, enliven our faith and give understanding.
— The People Called Methodists, p 64