How often human beings do not see in an unconfused way what exists, but rather what they crave to see! In how many cases do men believe something, not because they have discerned it, but because it is acceptable to them to believe! Or what errors arise because one does not go to the bottom of a thing, but forms a hasty judgment! All these reasons for deception in ordinary life might be multiplied indefinitely. What tricks are played upon sound judgment by partisan feeling, passion, and so forth. If such errors of judgment in ordinary life are disturbing and often disastrous, they are the greatest conceivable danger to the wholesomeness of the supersensible experience. No general rule can be given to the student for his guidance in the higher worlds, beyond the advice to do everything possible for his healthy power of discernment and for his sound, independent judgment.
Source: Rudolf Steiner – GA 12 – The Stages of Higher Knowledge – Chapter 4: Inspiration and Intuition
Translated by by Lisa Monges and Floyd McKnight