The heart itself is only a small vessel, yet dragons are there, and lions; there are poisonous beasts and all the treasures of evil; there are rough and uneven roads; there are precipices; but there, too, are God and the angels; life is there, and the Kingdom; there, too, is light, and heavenly cities, and treasures of grace. All things lie within that little space.
–Saint Macarius the Great (c. 300-391)