What are the Seven Tatwas?
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Answers from the books of Samael Aun Weor

Akash is the principle of ether. Vayu is the etheric principle of air. Tejas is the etheric principle of fire. Prithvi is the etheric principle of the element earth. Apas is the etheric principle of water. There are two secret tattwas named Adi and Samadhi that vibrate during the aurora and are excellent for internal meditation (ecstasy or samadhi is achieved with them). We will not expand on these tattwas now because they are useful to advanced students only.