They accommodate people according to the different degrees of good karma they have accumulated and their different degrees of transcendence of birth-and-death. They are planes of existence manifested through a person's own spiritual powers, just as are the three "dark realms," --the existences of animal, hungry ghost and hell-being.
針對超離生死、個人所修善業的不等，天堂有等次，以對應不同修行，各層天，也就是個人以自身力量幻化出來的生命層次。