93. This is also the source of conjugial love, because that sphere affects the form of wisdom human beings have, and angels too. A human being can go on advancing in wisdom up to the end of his life in the world, and afterwards in heaven for ever. The more he advances in wisdom, the more perfect his form becomes. This form does not admit sexual love, but only the love of one of the opposite sex; with her he can be united down to the most intimate level, which contains heaven and its happiness, and this union is the product of conjugial love.