It is not only to researchers into the spiritual world that the observer of the supersensible has to speak. He must address his words to all men, because he has to give an account of things that concern all men. Indeed, he knows that without a knowledge of these things no one can, in the true sense of the word, be a human being. Thus, he speaks to all men because he knows there are different degrees of understanding for what he has to say.
The feeling for truth and the power of understanding it are inherent in everyone, and he knows that even those who are still far from the moment in which they will acquire the ability to make their own spiritual research can bring a measure of understanding to meet him. He addresses himself first to this understanding that can flash forth in every healthy soul. He knows that in this understanding there is a force that must slowly lead to the higher degrees of knowledge.
This feeling, which perhaps at first perceives nothing at all of what it is told, is itself the magician that opens the “eye of the spirit.” In darkness this feeling stirs. The soul sees nothing, but through this feeling it is seized by the power of truth. The truth then gradually draws nearer to the soul and opens the higher sense in it. In one person it may take a longer, in another a shorter time. Everyone, however, who has patience and endurance reaches this goal, for although not every physical eye can be operated on, every spiritual eye can be opened. When it will be opened is only a question of time.
Source: Rudolf Steiner – GA 9 – Theosophy – An Introduction to the Supersensible Knowledge of the World and the Destination of Man
Translated by Henry B. Monges and revised for this edition by Gilbert Church, Ph.D.