“Those who are born with the possession of knowledge are the highest class of men. Those who learn, and so readily get possession of knowledge, are the next. (…) I am not one who was born in the possession of knowledge; I am one who is fond of antiquity, and earnest in seeking it there.” - Confucius
“For again I say, all things are One in Me as man is, when he knoweth Me in him. All knowledge existeth. All knowledge cometh to man in its season. Cosmic messengers periodically give to man such knowledge of My Cosmos as man is able to comprehend, but that which he can bear is like unto a thimbleful out of the mighty ocean for man is but beginning to comprehend.” - universal One (via Walter Russell)
“One distinctive feature of Cosmic Consciousness is that everyone who experiences it states the same things. They all experience a tremendous state of ecstasy, which is the God Nature – a deep conviction of Love and the Oneness of God and man – and the idea of evil and death entirely disappears into their complete knowledge of immortality and eternal life. Whatever a Cosmic Conscious mystic writes is fully understood by any other mystic. No matter how different the words may be, their sense is universal. Their language is alike but it is strange to all but those of high culture or great spiritual unfolding.” - Lao Russell
The messengers are bound to a 'time and space' in the unfolding of mankind. Not all they knew could be understood by the people then and there, what mattered most was that now another major step towards God's plan for mankind could be taken by anyone touched by their message.
“In Jesus' day man was not ready for the fullness of His mighty teachings. Man was still new. He was still in the ferment of his intellectual brewing, still searching for the avenging god of tradition to whom he could appeal for preferential rulings. Jesus gave to man the One great message of all time. He taught the universality of all things in the white light of the universal One of impartial love from Whose rulings there is no appeal. But only a few could faintly understand. Today the world is ready and eagerly awaits the completion of His message. When Jesus said: “I have yet many things to say unto you, but ye cannot bear them now”, he referred to His complete knowledge of the universal force.” - Walter Russell
“Every one of the great mystics who have been anointed in the Light of all-knowing have uplifted countless millions of men who become their followers. The great religions of the world grew out of the Illuminations of such supreme mystics as Buddha, Mohammed, the unknown mystic who wrote The Bhagavad-Gita, (which became the Persian Bible) and Jesus. Of these, Jesus was, in all probability, the only fully illumined one as He alone fully understood the love principle as the basis of Creation, and the magnetic Light of God as the Source of Creation. He alone of all the mystics had all-knowing to the extent that He so fully comprehended His divinity as Son of God that he could say “I and My Father are one” and KNOW what it meant. Full Illumination is the goal of all mankind. It is the Christ status which no mystic of past ages has acquired but all men will acquire when the journey of unfolding man on this planet will have been completed.” - Walter Russell
Though the goal of all messengers is the same, there is an important difference between a partial and full illumination of a messenger. The latter form of consciousness - also called “Christ consciousness” - is extremely rare and transcends physical reality. The body is left behind during a 'period of time', while the soul is in communion with the Light of God. The message from such a messenger also trancends time and space to the fullest degree, if the person is able to sufficiently express this all-knowing into this world. Going by their message, it seems likely that in this world, at least the unknown author of the principal Upanishads, Jesus of Nazareth and Walter Russell have been fully illuminated by the Light of God.