It is truly admirable within the meaning of admire and wonder at the same time, that a letter of the alphabet is by itself a topic of great discussions. The atmosphere surrounding the letter epsilon, and by extension the Delphic epsilon, as it is called, is very mystical.
The Delphic Epsilon was placed at the top of the pediment of the temple of Apollo at Delphi and it was accompanied the known to everyone “know thyself” and “Meden Agan” in the lower right corner of the same pediment.
The letter epsilon as a symbol, for the uninitiated, is directly related to the Delphic solar rituals, the initiation and more simply, of man to the light. Therefore, its placement at the top of the pediment of the temple of Apollo declares the perpetual relationship with the light, the perfection and therefore epsilon indicates the luminous. We understand that this is thus the key for all the Delphic mysteries.
The only information that we have, come from Ploutarchos, and this because the disclosure to someone uninitiated was a morale and criminal offense. From Pythagoras we know that the letter epsilon as a number is denoted by five. The interest in my opinion on this is that the number five stands for the four cosmological elements, such as land, air, water and fire with the quintessential of ether. And I say interesting because, all of the above mentioned synthesize human.
By analyzing further the letter epsilon, we find that it is the second of letters, of those having voice and it declares Apollo, the second largest after the god Zeus. On the other hand the number five indicates the concept of numbers as a “fifth” and thus is expressed the Pythagorean view that the number is the first and the ultimate cause of all things and that God eternally geometrizes.
According to Plutarchos, therefore, who is also our only source, as I have already stated, the unit is common in power in both species. This happens because if the unit is added to any number, makes the even number an odd and the odd number an even. Number two, on the other hand is the first even number and number three is the first odd. Therefore, the sum of these two numbers gives an excellent value, because as a first number it consists of first numbers and has been called by the Pythagoreans a marriage, because of the similarity with the unifying relationship, of even numbers to the woman and of odd numbers to the man.
Something else that we also find, is that by none mixture of them, not an even number is born, but always an odd number and never an even number when added to it even creates an odd number, but neither comes by nature, than just the inability to give birth to another. We understand, however, that if odd numbers are added to odd numbers generate many even numbers. All of the above mentioned is due to the understanding of the relationship with Apollo’s epsilon. The common point lies exactly in that Apollo is praised as eternal and indestructible, in correspondence with the epsilon (five) which if multiplied by itself it always ends in himself or in tens. And this is done indefinitely.
Finally, I would like to point out that behind the Greek language lies an entire philosophical system. The Greek language is the Word, and the Word is expressed ambiguous and proportionally to countless scaled levels.