It is impossible that God should take pleasure in wickedness and therefore, the wicked have no vision of God, for they do not see God’s love. Jonathan Edwards writes:
“Blessed are the pure in heart: for they shall see God.” (Matthew 5:8)
It becomes persons when they come into the presence of a king, so to attire themselves, that they may not appear in a sordid habit, and it would be much more unsuitable still, for any to come all defiled with filth. But sin is that which renders the soul much more loathsome in the sight of God. This spiritual filth is of a nature most disagreeable to that pure, heavenly light; it would be most unsuitable to have the pollution of sin and wickedness, and the light of glory, mixed together; and it is what God never will suffer. It would be a most unbecoming thing for such to be the objects of God’s favor, and to see the love of God, and to receive the testimonies of that love. It would be most unsuitable for the glorious and most blessed God to embrace in the arms of his love, that that is infinitely more filthy than a reptile.
It is naturally impossible that the soul, which is impure, should see God. The sight of God’s glory, and impurity of heart, is not compatible in the same subject. Where spiritual defilement holds possession of the heart, it is impossible that the divine light, which discovers God’s glory, should enter. How can he, who is under the power of enmity against God, and who only hates God, see his beauty and loveliness at the same time? Sin, so long as it has the government and possession of the soul, will blind the mind and maintain darkness. As long as sin keeps possession, the heart will be blinded through its deceitfulness.
What pleasure would it give to the soul that hates holiness, to see the holiness of God? What pleasure to them who are God’s enemies, to see his greatness and glory? Wicked men have no relish for such intellectual, pure, and holy delights and enjoyments. As we have observed already, to have a relish for spiritual enjoyments is one part of the purity of heart spoken of in the text. (“The Pure in Heart Blessed”)