The Dharmakaya, like the sky, is Buddha, the great Vajradhara. The thick rain clouds of wisdom are the two Bodhisattvas.... Self-luminous unchanging insight is characterised as unborn Dharmakaya. Unceasing self-born wisdom is described as the manifold of Nirmanakaya. These two fused in co-emergence are described as Sambhogakaya. And these three, free from origination, are called the Svabhavikakaya. All these, transcending conditions, are the Mahasukhakaya. These are the five ultimate kayas. O friends of the heart! Are your minds gladdened? 

-- Marpa