Selection from Heaven and Hell ~ Emanuel Swedenborg
Everything in nature that comes into existence and continues in existence from Divine order is a correspondence. The Divine good that proceeds from the Lord makes Divine order. It begins from Him, goes forth from Him through the heavens in succession into the world, and is terminated there in ultimates. The things that are there in accordance with order are correspondences. All things there which are good and perfect for use are in accordance with order, for all good is good according to use, while the form has relation to truth since truth is the form of good. For this reason all things which are in Divine order in the whole world and also partake of the nature of the world, have relation to good~~~
How the conjunction of heaven with the world is effected by means of correspondences —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. On this account, the universe has been so created and formed by the Divine that uses may be everywhere 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 ultimates of nature. Hence it is evident that the correspondence of natural things with spiritual things, or of the world with heaven, is through uses and that uses conjoin.
And the forms in which uses are clothed are correspondences and means of conjunction just to the extent that they are forms of uses.
In nature, in its threefold kingdom, all things that come into existence 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. With man, however, so far as he lives in accordance with Divine order, thus, so far as he is in love to the Lord and in charity towards the neighbour, to that extent, his actions are uses in form and are correspondences by means of which he is conjoined with heaven.
To love the Lord and the neighbour means in general to perform uses.Further, it ought to be known that man is the means by which the natural world is conjoined with the spiritual world, that is, man is the medium of conjunction; for in him there is a natural world and also a spiritual world. Therefore, to the extent that man is spiritual, so far 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 the mediation of man, Divine influx into the world and also into the things of the world pertaining to man, goes on, but not into man's rational faculty.
(from Heaven and Hell 107; 112)