Since it is through the possession of happiness that people become happy, and since happiness is in fact divinity, it is clear that it is through the possession of divinity that they become happy. But by the same logic as men become just through the possession of justice, or wise through the possession of wisdom, so those who possess divinity necessarily become divine. Each happy individual is therefore divine. While only God is so by nature, as many as you like may become so by participation. (Trans. V.E. Watts)
Boethius (or, rather, Philosophy) goes on to argue that happiness = goodness, so you are not truly happy unless you are truly good. This is part of the argument that only God, the Supreme Good, is ultimately happy. That’s a necessary piece of context. (For more context, read my review.) It’s important, because if committing murder or lying to people or stealing make you have feelings you call ‘happy’, this does not mean you are participating in divinity. In fact, according to Boethius, you wouldn’t be happy at all because evil is itself a tendency towards non-existence.
Upon reading this passage, those of us who spend time with the Eastern Orthodox will immediately cry aloud, ‘Ah, theosis!’ And, indeed, it is part of what is going on here, part of the passage from praktike to theoria symbolised by Philosophy’s gown as she stands before the senator in his prison cell. Of these latter two words, theoria is usually Englished as contemplation. So we are back in our sixth-century contemplative context, a few decades before Gregory the Great and Augustine of Canterbury.
This, I would argue, is the philosophical basis of Christian mysticism. God is good. To be truly happy, one must be good. God is wholly good, so he is perfectly happy. Therefore, for us to become happy, we have to connect with God and have communion with Him.