Those who are always saying: ‘That is not in the Bible, that is not true Christianity and those who maintain that it is, are heretics’, must be reminded that Christ also said: ‘I have yet many things to say unto you, but ye cannot bear them now’. He did not say this in order to indicate that He wished to withhold anything from men, but that from epoch to epoch He would bring them new revelations. And this He will do through those who are willing to understand Him. Those who deny that there can be new revelations do not understand the Bible, neither do they understand Christianity. For they have no ears for what is implied in the admonition given by Christ: ‘I have still much to say to you — but prepare yourselves in order that you may be able to bear it and understand it.
Source: Rudolf Steiner – GA 127 – The Concepts of Original Sin and Grace – Munich, 3rd May 1911