When I first saw this when it was first shown on 28th of April I had an answer in mind after reading it several times but there were other things on my mind and it needed some time to formulate a reasonable explanation. So it had been on my mind to do it today.
The Gospel Of Philip
The sons of heavenly Man outnumber
the sons of earthly man.
Though the sons of Adam are many, they are mortal;
the sons of the realized Man [telleios] never die,
for they are constantly being reborn.
The Gospel Of Philip
Translated by Jean-Yves Leloup
The sons of heavenly Man ( The total number of spirits dwelling in the spiritual world since the creation of mortals) outnumber
the sons of earthly man ( Those who presently reside on planet Earth).
Though the sons of Adam are many, they are mortal; ( There are two possibilities here, the first being that the sons of Adam continue to be physically born on Earth if it is taken that Adam is the first human ancestor, therefore they will physically die, but also there is the spiritual death that Jesus spoke about, and this could also apply to those who are already in the spirit world. In The True Gospel Revealed Anew by Jesus it is spoken of those who enter the spirit world only developing their Natural love while those who acquire God’s Divine Love will exist for eternity, to be immortal, in the Celestial Heavens).
the sons of the realized Man [telleios] never die,
for they are constantly being reborn. ( On looking up the word tellios, one of the meanings is given as perfect. In the True Gospel Revealed Anew by Jesus the term perfect refers to those who have attained the position of Adam and Eve before the Fall. That then is the starting point. It has been described that in the spiritual world there are many realms or levels and to be allowed admission depends solely on the level of spiritual growth or development. So just like when Nicodemus asked Jesus what he must do to enter the Kingdom of Heaven, Jesus replied that he must be born again. So in this context, being reborn could refer to the process of moving up through the levels. This is my interpretation of this passage anyway).
This is a well-thought clearly writen post that also evokes the reader into further insight.