By its very nature, heaven is full of pleasures, even to the point that if we see it as it really is, it is nothing but bliss and pleasure. This is because the divine good that emanates from the Lord’s divine love constitutes heaven both overall and in detail for everyone there; and divine love is the intent that everyone should be saved and should be most profoundly and fully happy. This is why it is all the same whether you say “heaven” or “heavenly joy.”
Heaven’s pleasures are both indescribable and innumerable; but no one can realize or believe anything about their multitude who is wholly wrapped up in pleasures of the body or the flesh. This, as I have already said, is because their deeper levels are looking away from heaven toward the world, which is backward. For no one who is wholly involved in pleasures of the body or the flesh (or in love for oneself and the world, which is the same thing) feels any pleasure except in eminence or profit or in physical and sensory gratification. These stifle and smother deeper pleasures of heaven so completely that people do not even believe such pleasures exist. So they would be quite bewildered if they were so much as told that any pleasures remain once the pleasures of eminence and profit have been taken away; and they would be even more bewildered if they were told that the pleasures that take their place are countless and simply defy comparison with pleasures of the body and the flesh, especially pleasures of eminence and profit. We can see, then, why people do not know what heavenly joy is.
from Heaven and Hell, Sections 397, 398