A minister is set to be a light to men’s souls, by teaching, or doctrine. And if he be a shining light in this respect, the light of his doctrine must be bright and full; it must be pure without mixtures of darkness; and therefore he must be sound in the faith, not one that is of a reprobate mind; in doctrine he must show uncorruptness; otherwise his light will be darkness. He must not lead his people into errors, but teach them the truth only, guiding their feet into the way of peace, and leading them in the right ways of the Lord.
He must be one that is able to teach, not one that is raw, ignorant or unlearned, and but little versed in the things that he is to teach others; not a novice, or one that is unskillful in the word of righteousness; he must be one that is well studied in divinity, well acquainted with the written Word of God, mighty in the Scriptures, and able to instruct and convince gainsayers.
And in order to be a “shining light,” he must be one that really knows what religion is, one that is truly acquainted with that Savior and way of salvation, that he is to teach to others, that he may “speak the things that he knows, and testify the things that he has seen” [John 3:11], and not be a blind leader of the blind. He must be one that is acquainted with experimental religion, and not ignorant of the inward operations of the Spirit of God, nor of Satan’s devices; able to guide souls under their particular difficulties. Thus he must be a scribe well instructed in things that pertain to the kingdom of God; one that “brings forth out of his treasures things new and old” [Matthew 13:52].
And in order to his being a “shining light,” his doctrine must be full, he must not only be able to teach, but apt to teach, ready to instruct the ignorant, and them that are out of the way, and diligent in teaching, in public and private; and careful and faithful to declare the whole counsel of God, and not to keep back anything that may be profitable to his hearers. Also his being a “shining light” implies that his instructions are clear and plain, accommodated to the capacity of his hearers, and tending to convey light to their understandings.
Adapted from an ordination sermon Edwards preached on August 30, 1744. The sermon is called The True Excellency of a Minister of the Gospel.