In order to accept and perceive the light of Christ in one’s heart, it is necessary to divert oneself from the external as much as possible. First, by cleansing the soul with penitence and good deeds with true faith in the Crucified; then, by closing the physical eyes, it is necessary to immerse the mind in the heart and appeal to the name of our Lord Jesus Christ continually. Then, by measure of our zealousness and fervor of spirit for the Beloved (Lk. 3:22), a person with the calling of this name finds delight, which arouses a thirst toward greater enlightenment.
When a person internally contemplates the eternal light, his mind becomes clean and free of any sensory notions. Then, by being completely immersed in the contemplation of uncreated beauty, he forgets everything sensory, does not want to see even himself, but desires to hide in the heart of the earth, if only not to be deprived of this true good — God.
St. Seraphim of Sarov