The Lord said ‘you are either for me or against me’. Our relationship with Him is reciprocal. People have to inwardly choose of their own will to make themself vulnerable and open to receiving God, and some are not willing. People know how to look good on the outside sometimes, while shut down, closed, or have ill-will on the inside. Entertaining evil, Chronic pride and denial eventually closes the internals of a person. Swedenborg says people can refuse God to the point their internals become closed, and such a person can not receive heaven.
Choosing to not accept God is at the same time actively rejecting God at some point, which is another way of saying we are ‘either for or against God’. No one can presume to be neutral to God. Acknowledging God makes him present, by denying Him we, at some point, lose the presence and protection of his angels (to the degree we reject) because reception is reciprocal, that is, God receives us to the degree we reach and open to Him from our will (for he is always turned to us). On earth people have an internal and external self and we can hide in the external. We can ‘put on a face’ with our body and do good and moral things for the sake of business and appearance, while being selfish and entertain evil inside. Remains (innocence stored in our soul) are always there, but become dormant and closed when we chronically reject God. As long as we are on earth, as I understand it, it is possible to reform, although it requires cognition to willingly submit to him, so it often becomes more difficult as we get old because of habit, fixation and loss of cognition.
Once in the spiritual world a person cannot change the basic constellation that has formed in their soul. The constellation is determined by the degree of correspondence between our internal and external self at the time of death. The more they are in harmony the more heavenly, the less in harmony the more hellish. The constellation then is like a seed from which we grow. The constellation itself can’t change anymore because we no longer have the material component of our body from which it was formed in conjunction with the soul. In the spiritual world we only have the spiritual body. The spiritual body has refined abilities that are many times greater than the physical body. If the constellation is receptive to heavenly light it grows and increases in joy for eternity. If not it is in a hell according to its types of evil loves.
In truth there is great pain in rejecting God, and this is because of the presence of remains. The remains are urging us to not be hard hearted but to receive him. Remains soften our heart so we become humbled and see and cry out to God. Those who persist in rejecting him have to keep doubling down over and over to stifle the pain from the presence of remains until the remains are silenced, and closed. But they never go away.