In general, God guides and directs His people, by affording them, in answer to prayer, the light of His Holy Spirit, who enables them to understand and to love the Scriptures.
The word of God furnishes us with just principles, and right apprehensions, to regulate our judgments and affections, and thereby to influence and direct our conduct. Those who study the Scriptures, in a humble dependence upon Divine teaching, are taught to make a true estimate of everything around them, and are gradually formed into a spirit of submission to the will of God. They thereby discover the nature and duties of their several situations and relations in life, and the snares and temptations to which they are exposed.
The word of God dwelling richly in them, is a preservative from error, a light to their feet, and a spring of strength and consolation. By treasuring up the doctrines, precepts, promises, examples, and exhortations of Scripture, in their minds, and daily comparing themselves with the rule by which they walk, they grow into a habitual frame of spiritual wisdom, and acquire a gracious taste, which enables them to judge of right and wrong with a degree of readiness and certainty, as a musical ear judges of sounds. And they are seldom mistaken, because they are influenced by the love of Christ, which rules in their hearts, and a regard to the glory of God, which is the great object they have in view.
The Lord, whom they serve, does not disappoint their expectations. He leads them by a right way, preserves them from a thousand snares, and satisfies them that He is and will be their guide even unto death.
(John Newton's Letters)