There is in you, human beings, a desire to contemplate the True Good. But when you hear that the Divine Majesty is exalted above the heavens, that Its glory is inexpressible, Its beauty ineffable, and Its Nature inaccessible, do not despair of ever behold what you desire. It is indeed within your reach: you have within yourselves the standard by which to apprehend the Divine. For He who made you did at the same time endow your nature with this wonderful quality. For God imprinted on it the likeness of the glories of His own Nature, as if moulding the form of a carving into wax. But the evil that has been poured all around the nature bearing the Divine Image has rendered useless to you this wonderful thing, that lies hidden under vile coverings. If, therefore, you wash off by a good life the filth that has been struck on your heart like plaster, the Divine Beauty will again shine forth in you.
It is the same as happens in the case of iron. If freed from rust by a whetstone, that which but a moment ago was black will shine and glisten brightly in the sun. So it is also with the inner man, which the Lord calls the heart. When he has scraped off the rustle dirt which dank decay has caused to appear on his form, he will once more recover the likeness of the archetype and be good. For what is like to the Good is certainly itself good. Hence, if a man who is pure of heart sees himself, he sees in himself what he desires; and thus he becomes blessed, because when he looks at his own purity, he sees the archetype in the image.” St. Gregory of Nyssa, Homily 6 on The Beatitudes
One must only look within to being to perceive the glory of God. However, there is much rust and corrosion of the soul that we must break off in order to see God. Should we be able to see ourselves as God made us, we shall be able to contemplate Him more truly. Those coverings of sin and desire that we have sunk our lives into prevent us from seeing reality as it is and therefore from perceiving the presence of God. The more we shine the mirror of our souls, the more God is apparent.