An Esoteric Forecasting Method

I quote from this site: "It is said that the market analysis technique of W. D. Gann is one of the most accurate forecasting techniques to stocks, commodities, futures and forex ever on the world. Yet, his esoteric methods with numerical charts fetter most of the new comers and make the most committed trader exhausted."

Pay particular attention -- the word esoteric is mentioned.The synonym of esoteric is mysterious. Take it for what its worth.