Recently I was reading through a sermon by Jonathan Edwards called "A Divine and Supernatural Light." I found the following quotes particularly helpful:
"A true sense of the divine and superlative excellency of the things of religion; a real sense of the excellency of God and Jesus Christ, and of the work of redemption, and the ways and works of God and Jesus Christ, and of the ways and works of God revealed in the gospel. There is a divine and superlative glory in these things; an excellency that is of a vastly higher kind, and more sublime nature than in other things; a glory greatly distinguishing them from all that is earthly and temporal. He that is spiritually enlightened truly apprehends and sees it, or has a sense of it. He does not merely rationally believe that God is glorious, but he has a sense of the gloriousness of God in his heart. There is not only a rational belief that God is holy, and that holiness is a good thing, but there is a sense of the loveliness of God's holiness. There is not only a speculatively judging that God is gracious, but a sense of how amiable God is upon that account, or a sense of the beauty of this divine attribute."Quote 2
"...there is a difference between having an opinion, that God is holy and gracious, and having a sense of the loveliness and beauty of that holiness and grace. There is a difference between having a rational judgment that honey is sweet, and having a sense of its sweetness. A man may have the former, that knows not how honey tastes; but a man cannot have the latter unless he has an idea of the taste of honey in his mind. So there is a difference between believing that a person is beautiful, and having a sense of his beauty. The former may be obtained by hearsay, but the latter only by seeing the countenance...When the heart is sensible of the beauty and amiableness of a thing, it necessarily feels pleasure in the apprehension."Quote 3
"Reason may determine that a countenance is beautiful to others, it may determine that honey is sweet to others; but it will never give me a perception of its sweetness."Quote 4
"...the least glimpse of the glory of God in the face of Christ doth more exalt and ennoble the soul, than all the knowledge of those that have the greatest speculative understanding in divinity without grace."