I am going to extract a paragraph from the book "meditations on the tarot" about the devil card:

"The ideas that are evoked by the totality of the card and its context are rather those of slavery, im which two personages are found who are attached to the pedestal of a monstrous demon. The card does not suggest the metaphysics of evil, but rather an eminently practical lesson as to how it happens that beings can forfeit their freedom and become slaves of a monstrous entity which makes them degenerate by rendering them similar to it."

"The theme of the fifteen Arcanum of the Tarot is one of the generation of demons and of the power that they have over those who generate them. It is the Arcanum of the creation of artificial beings and of the slavery into which the creator can fall - becoming a slave of his own creation."

I love this type of content. Also this book is highly recommended.