161. Since times in like manner are settled and constant, they also are a property of nature; for the length of a day is constantly twenty-four hours, and the length of a year is constantly three hundred and sixty-five days and a quarter. The very states of light and shade, and of heat and cold, which cause these periods to vary, are also regular in their return. The states which recur daily are morning, noon, evening, and night; those recurring yearly are spring, summer, autumn, and winter. Moreover, the annual states modify regularly the daily states. All these states are likewise dead because they are not states of life, as in the spiritual world; for in the spiritual world there is continuous light and there is continuous heat, the light corresponding to the state of wisdom, and the heat to the state of love with the angels; consequently the states of these are living.