5547. ABOUT HEAVEN IN GENERAL AND ABOUT ITS DEGREE. There are heavens above heavens, and communication between them. Spirits and angels do not know how the case is with the communication and conjunction, except those who are in the highest heaven. There are seven degrees of these, distinguished, in general, between those who are internal and those who are external. Those who are internal are called celestial, and those who are external are called spiritual. The internal are distinguished into three, and the external into three; and, between the internal ones and the external ones is given a medium for the sake of conjunction. The ones who constitute the medium are called celestial-spiritual. Hence it is that there are seven degrees.