He who has no religious affection is in a state of spiritual death, and is wholly destitute of the powerful, quickening, saving influences of the Spirit of God upon his heart. As there is no true religion where there is nothing else but affection, so there is no true religion where there is no religious affection…If the great things of religion are rightly understood, they will affect the heart. 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.

Jonathan Edwards, The Religious Affections (pgs. 49-50)