Sources for theology

...people devoid of the Spirit cannot comprehend the Scriptures as God intends. Furthermore, God can work directly in a person’s life without utilising the Scriptures (or any other means) at all. Wesley has made it clear that it is the direct authority of the Spirit that is absolutely indispensable in theologising, making God himself the sole authority in matters of faith and practice.—Wesley as a Pastoral Theologian, page 103