430. There are two doors in each of us as well, one facing hell and open to evil and false things from hell, the other facing heaven and open to good and true things from heaven. The door of hell is opened for people who are involved in what is evil and its consequent falsity, though just a little light from heaven flows in through the cracks, which enables us to think, reason, and talk. On the other hand, the door of heaven is opened for people who are focused on what is good and therefore on what is true. There are actually two paths that lead to our rational mind, one from above or within, through which the good and the true enter from the Lord, and one from below or outside through which the evil and the false infiltrate from hell. The rational mind itself is at the intersection of these two paths, so to the extent that light from heaven is let in, we are rational; but to the extent that it is not let in, we are not rational even though we seem so to ourselves.
I have mentioned these things so that our correspondence with heaven and with hell may be known. While our rational mind is in the process of being formed, it is responsive to the world of spirits. What is above it belongs to heaven, and what is beneath it belongs to hell. The higher things open, and the lower close against the inflow of evil and falsity, for people who are being readied for heaven; while the lower things open, and the higher close against the inflow of goodness and truth, for people who are being readied for hell. As a result, these latter can only look downward, toward hell, and the former can only look upward, toward heaven. Looking upward is looking toward the Lord, because he is the common center that everything in heaven faces. Looking downward, though, is looking away from the Lord toward the opposite center, the center toward which everything in hell faces and gravitates (see above, 123, 124).
(References: Heaven and Hell 123-124)