245. We will now explain the nature of the influx of light into the three degrees of life in a person, degrees which are those of the mind. The forms in a person which are receptacles of warmth and light or of love and wisdom, and which, as said, exist in a threefold order or in three degrees, are from birth transparent, transmitting spiritual light as clear glass does natural light. It is because of this that a person can be elevated even into the third degree in respect to wisdom. Nevertheless, these forms still are not opened unless and until spiritual warmth is added to spiritual light or love to wisdom. By their union these transparent forms are opened, one degree after another. The case is the same as with the light and warmth of the world's sun in respect to vegetation on earth. The light in winter, which is just as bright as the light in summer, does not open anything in a seed or a tree, but when the warmth of spring is added to the light, then it does. The case is the same because spiritual light corresponds to natural light, and spiritual warmth corresponds to natural warmth.