"Every interpretation is hypothetical, for it is a mere attempt to read an unfamiliar text. An obscure dream, taken by itself, can rarely be interpreted with any certainty, so that I attach little importance to the interpretation of single dreams. With a series of dreams we can have more confidence in our interpretations, for the later dreams correct the mistakes we have made m handling those that went before. We are also better able, in a dream series, to recognize the important contents and basic themes."