Evening, a time when the light and heat are fading away, represents a state in which a person -- or a community of people -- is turning away from the Lord, with little desire left to be good and little knowledge left regarding what good is. Evening is often a time of judgment.

In Genesis 19:1, the evening signifies the visitation that comes before judgment. (Arcana Coelestia 2318)

In Genesis 30:16, this signifies the good or truth in a state of good, but in the obscurity that is characteristic of the natural. (Arcana Coelestia 3949)

2971. 'The field and the cave which was in it' means as regards the good and truth of faith. This is clear from the meaning of 'the field' as the Church and also good itself which constitutes the Church (that which is celestial - or good that stems from love to the Lord and charity towards the neighbour - is compared to 'the ground' as well as to the field, and is actually called these, because that which is celestial - or good - is the recipient of the truths of faith; and these truths are compared to and are also actually called 'seeds'); and from the meaning of 'a cave' as the truth of faith which is enveloped in obscurity, dealt with in 2935. It is said to be in obscurity because it is with spiritual people, see 1043, 2708, 2715.