Learn Greek In A Week: A Spiritual Approach to Language - Dimitris Spentzos
Athens 1996 - New Temple of Delphi

This book is NOT about learning Greek in one week. It's about a creative, spiritual direct etymology between English and Greek.  I find it very convincing, but I'm not a professional.  As there is only indexed mention of this book (on Bookreads) on the entire internet, I must assume not many people have read this.  Here's a quote from the introduction:

"Man has not developed his language in order to secure the means for a better life - which by the way does not demand a special love for logos - but in order to express abstract notions that explain his relation to the universe.  His presence in a fantastic and miraculous world on one hand and his predicament for the transient and casual nature of his existence on the other, inspired him to develop the powers of his mind to organize and communicate his thoughts in a language that could explain his rapport to the Cosmos. For this reason, from the beginning of man's organized life on earth, the formation of language had a direct relationship to his spiritual orientation."
"The Greek Language was born out of this spiritual necessity and was formed under two different influences.  The first was the Mystical knowledge of the Vedic texts which influenced its literary form, and the second was the Magical knowledge of the ancient Egyptians which influenced mainly its mathematical structure."