dharmakaya (San. “dharma body”): Enlightened mind itself, without name or form, in contrast to the rupakaya, its various forms or manifestations.
rupakaya (San. “form body”): The form or manifestation of the dharmakaya. It has two aspects: sambhogakaya (San. “enjoyment body”) and nirmanakaya (San. “emanation body”).
three secrets: The three gates—body, speech, and mind—of an enlightened being.
vajra nature: The indestructible wakefulness that manifests compassion; sacred perception of the world.