Some who had no idea what heavenly joy was were abruptly carried up into heaven. They had been reduced to a condition in which they could be lifted up, their bodily desires and their delusions having been put to sleep. I heard one of them saying to me from there that now for the first time he could feel how much joy there was in heaven. He admitted that he had been grossly deceived, that he had held a very different view, and that he could now perceive the deepest degree of his own joy, which was immeasurably more than he had ever felt at the peak of any sensual experience during his physical existence. He called the pleasures that [he and his companions] usually enjoy foul.
In those who are taken to heaven for the purpose of discovering what it is like, bodily desires and delusions are put to sleep, since no one can enter heaven bringing such things along from the world. Either that or they are surrounded with the aura of spirits who moderate the unclean and discordant things in them in a miraculous way. Some people may have their inner recesses opened. These are some of the methods [of preparation], and there are others, depending on the way people have lived and the character they have acquired along the way.
from Secrets of Heaven, Volume 1, Sections 541, 542