[2] Scarcely anyone in the world can believe that the angelic heaven can have so great a yearning for truths and forms of good, and for cognitions of them. For people whose minds are set on nothing else than gain and glory, and who are given up to worldly pleasures, will be amazed to learn that those things constitute angelic life. 'What use they will say 'are cognitions of goodness and truth to me? What life can they give me? The things that bring me life and my life's delight are wealth, position, and worldly pleasures!' But let those who speak like this know that the life these things bring is that of the body, not that of the soul, and that the former kind of life perishes along with the body, whereas the latter kind remains for ever. Let them also know that people are ill-advised if while in the world they do not give any thought to spiritual life.

[3] Further as regards desolation, it exists on account of the yearning; for forms of good and truth are accepted in the measure that they are yearned for, and when the desires created by the yearning are fulfilled they produce feelings of happiness and bliss. In the next life therefore those who pass through desolation are refreshed immediately afterwards and realize their desires; everyone there is made more perfect by means of such alternating experiences. It is a fact worthy of note that the changing times of day in the natural world - morning, midday, evening, night, and morning again - are wholly representative of the changes that take place in the spiritual world, yet with one difference. The changes that occur in the spiritual world have an effect on the understanding and the will, establishing in them the basic elements of life, whereas the changes that occur in the world have an effect on and sustain things of the body.

[4] What is even more noteworthy is the fact that it is not the Lord who brings on the shades of evening and the darkness of night but those characteristics of angels, spirits, or men that are entirely their own. For the Lord as the Sun shines and flows in constantly; but because the evils and falsities that spring from what is his own are present in a man, spirit, or angel, they turn and direct him away from the Lord. In so doing they bring him into the shades of evening, and lead the wicked into the darkness of night. It is similar to the way things are with the sun in our world. It shines and flows in constantly, but the earth by rotating on its axis turns away from the sun and brings itself into shade and darkness.

[5] These features of the natural world come about because the natural world comes into being from the spiritual world and is also kept in being from there, as a consequence of which the entire natural system is a theatre representative of the Lord's kingdom, 3483, 4939. The purpose served by the changes that take place in the spiritual world is that all who are in heaven may constantly become more perfect. Such changes exist in the natural world for the same reason, for if they did not occur everything there would perish because of drought.

[6] It should be recognized however that in heaven there is no night, only evening, which is followed by the twilight that comes before morning; but in hell there is night. Changes take place there also, but they are of a contrary nature to those in heaven. In hell morning is the heat of evil desires, midday is the itch of false ideas, evening is anxiety, and night is torment. But through all these changes night predominates; merely variations of shade and darkness are what bring about those changes. In addition to this it should be recognized that in the spiritual world the changes which take place are not the same with one person as they are with another, also that the changes there do not divide into regular periods of time because they are variations of state that produce those changes. For instead of the periods of time that occur in the natural world there are states in the spiritual world, 1274, 1382, 2625, 2788, 2837, 3254, 3356, 4814, 4916, 4882, 4901.