91. But unless man's state in which, from being spiritual, he is becoming celestial is known, one cannot possibly perceive what these expressions embody, for they are quite deep arcana. When he is spiritual, the external man is not yet willing to comply with and serve the internal man, and so there is conflict. But when he is becoming celestial, the external man starts to comply with and serve the internal. As a result conflict ceases, and tranquillity ensues; see 87. This tranquillity is meant by 'the rain' and by 'the mist', for it resembles a mist, with which his internal man waters and bathes the external. This serenity which is characteristic of Peace brings forth the things which are called 'the shrub of the field' and 'the plant of the field'. Specifically, these are the rational concepts and the facts that have a celestial-spiritual origin.

In Daniel 4:27, this signifies internal peace when evils and falsities are removed, or when the spiritual man becomes celestial. (Arcana Coelestia 91, 93, 3696)