Selection from Heaven and Hell ~ Emanuel Swedenborg
How conjunction of heaven with the world is effected by means of correspondences shall also be told in a few words:The Lord's kingdom is a kingdom of ends, which are uses; or what is the same thing, a kingdom of uses which are ends. For this reason the universe has been so created and formed by the Divine that uses may be every where clothed in such a way as to be presented in act, or in effect, first in heaven and afterwards in the world, thus by degrees and successively, down to the outmost things of nature. Evidently, then, the correspondence of natural things with spiritual things, or of the world with heaven, is through uses, and uses are what conjoin; and the form in which uses are clothed are correspondences and are conjunctions just to the extent that they are forms of uses. In the nature of the world in its threefold kingdom, all things that exist in accordance with order are forms of uses, or effects formed from use for use, and this is why the things in nature are correspondences.
But in the case of man, so far as he is in accordance with Divine order, that is, so far as he is in love to the Lord and in charity towards the neighbor, are his acts uses in form, and correspondences, and through these he is conjoined to heaven.
To love the Lord and the neighbor means in general to perform uses.
Furthermore, it must be understood that man is the means by which the natural world and the spiritual world are conjoined, that is, man is the medium of conjunction, because in him there is a natural world and there is a spiritual world; consequently to the extent that man is spiritual he is the medium of conjunction; but to the extent that a man is natural, and not spiritual, he is not a medium of conjunction. Nevertheless, apart from this mediumship of man, a Divine influx into the world and into the things pertaining to man that are of the world goes on, but not into man's rational faculty.
(Heaven and Hell 112)
Read more: THE OCCUPATIONS OF ANGELS IN HEAVEN