There are three heavens. These follow in sequence and are independent. The deeper lives of the human mind and disposition are arranged in a similar pattern. We have a central nature, intermediate, and outward natures. This is because when humanity was created, the whole divine design was gathered into it, to the point that the human being is the divine design and is therefore a heaven in miniature. We are therefore in touch with heaven as with our inner natures. The outside and the inside in each particular heaven are like our own volitional side and its cognitive aspect. The volitional is like a flame and the cognitive like the light that it sheds. We may therefore conclude that the state of our inner nature is what constitutes heaven and that heaven is within each of us, not an external place.
Emmanuel Swedenborg, from Heaven and Hell