The hidden meaning of the Church of Sardis as written about in the Book of Revelation. Quoted from the lecture:

Today we are going to study the fifth church, the church of Sardis, thus we are entering into the mysteries of the word of God, related with the chakra Vishuddha. Marvelous knowledge is hidden within this church or chakra which we are going to disclose as best we can in order for you to benefit from the mysteries of the word of God, because really, if you visualize the tree of life (the ten Sephiroth), you discover that the imaginary man who is placed behind the tree of life has the Sephirah Daath precisely at his throat; and remember that Daath is Hebrew for “knowledge,” which in Greek is Gnosis.