you are those who have continued with me in my temptations, if you stay the course and keep following me, you will slowly see through the world and come to know the truth, and the truth will set you free from the rudiments of the world... translation mine.
"true Christians" are the ones who stay on the straight and narrow path and keep the faith... the truth comes in the form of transformation as the seed of Christ slowly grows inside us until we are changed into his likeness and attain his glory. That glory is the same light, truth, and way that Jesus brought. It isn't knowledge that can be read in a book, it is a slow daily transformation. A true Christian is one that has picked up his cross and died daily to himself long enough to be changed into his image and likeness... it is only after we are changed into his image and likeness that we become "little messiahs" - a true Christian is someone that shines with the glory of Christ, has the nature of the holy spirit, it isn't enough that they truly believe in their heart; the light can be hid under a bushel basket, only the lights that are shining forth to the world are testifying the truth, the light, and the way... true Christians are doors every bit the same as Jesus was the door... it is the holy spirit that opens the way into God... true Christians are the believers that are shining forth the holy spirit; lots of people believe, very few of them stay on the path of transformation, most fall back into their flesh.
CINO's have more than the name of Jesus, they truly believe in Jesus, as did the disciples Jesus was talking to in the verse I started with; but there's a long path of transformation that leads to the truth and only after we are transformed do we find the truth... the truth turns out to be a whole new life that the transformed Christian lives through the holy spirit. A true christian is a christian that is transformed enough to shine forth that light... a measure of it... and that's how we become little messiahs... Christian means little messiah.
