The reason why men are not affected by such infinitely great, important, glorious, and wonderful things, as they often hear and read of, in the word of God, is undoubtedly because they are blind; if they were not so, it would be impossible, and utterly inconsistent with human nature, that their hearts should be otherwise than strongly impressed, and greatly moved by such things.
A man's having much affection, does not prove that he has any true religion: but if he has no affection it proves that he has no true religion.
If it be so, that true religion lies much in the affections, hence we may infer, that such means are to be desired, as have much of a tendency to move the affections. Such books, and such a way of preaching the word, and administration of ordinances, and such a way of worshipping God in prayer, and singing praises, is much to be desired, as has a tendency deeply to affect the hearts of those who attend these means.
Jonathan Edwards, The Religious Affections