"In the beginning was the Word (Logos), and the Word was with God, and the Word was God." (John 1:1)...
This secret gnosis emphasized spiritual "resurrection" (i.e,. spiritual rebirth) and physical "resurrection" (i.e., reincarnation) as opposed to a resurrection defined as people sleeping in their graves until it is time their corpses to crawl out of their graves at the last day. Christian Gnostics held the view that if spiritual resurrection was not attained in one lifetime, then the soul would be subjected to as many reincarnations as it takes until spiritual rebirth is attained.
One of the great Church leaders was Clement of Alexandria in Egypt (150-211 A.D.) who indicated that he possessed the secret teaching handed down from the apostles.
In the Gnostic text entitled The Secret Gospel of Mark, one of the Christian Gnostic texts discovered in 1945, describes Jesus performing secret initiation rituals. Before the discovery of this secret gospel, our only knowledge of it came from a letter written by Clement. Clement quotes from this secret gospel and refers to it as, "a more spiritual gospel for the use of those who were being perfected." He also states, "It even yet is most carefully guarded [by the church at Alexandria], being read only to those who are being initiated into the great mysteries." Clement mentions elsewhere that Jesus revealed a secret teaching to those who were "capable of receiving it and being molded by it" He also affirmed that, "The gnosis (secret knowledge) itself is that which has descended by transmission to a few, having been imparted unwritten by the apostles." (Miscell. Book VI, Chapter 7)
The existence of a secret teaching can be found in the New Testament:
The secret of the kingdom of God has been given to you. But to those on the outside everything is said in parables so that, 'they may be ever seeing but never perceiving, and ever hearing but never understanding' (Mark 4:11-12)
"He replied, "The knowledge of the secrets of the kingdom of heaven has been given to you, but not to them. Whoever has will be given more, and he will have an abundance." (Matt. 13:11-12)
"We do, however, speak a message of wisdom among the mature, but not the wisdom of this age or of the rulers of this age, who are coming to nothing. No, we speak of God's secret wisdom, a wisdom that has been hidden and that God destined for our glory before time began." (1 Cor. 2:6-8 )
"So then, men ought to regard us as servants of Christ and as those entrusted with the secret things of God." (1 Cor. 4:1)
"At that time Jesus said, "I praise you, Father, Lord of heaven and Earth, because you have hidden these things from the wise and learned, and revealed them to little children. Yes, Father, for this was your good pleasure." (Matt. 11:25-26)