A sign is always less than the thing it points to, and a symbol is always more than we can understand at first sight. Therefore we never stop at the sign but go on to the goal it indicates; but we remain with the symbol because it promises more than it reveals. 483 If the contents of dreams agree with a sex theory, then we know their essence already, but if they are symbolic we at least know that we do not understand them yet. A symbol does not disguise, it reveals in time.
— C.G. Jung
Jung's distinction cuts against the instinct to decode. When a dream hands us an image we quickly recognize — the house, the water, the threatening figure — the first temptation is to collapse it into something we already possess: a theory, a category, a meaning that closes the question. That is treating a symbol as a sign, and the moment it becomes a sign we have stopped in front of it. We have the pointer but lost the direction.
What the symbol promises is not hidden behind it, waiting to be extracted by the right hermeneutic. It reveals in time — meaning the symbol itself changes as the psyche that encounters it changes, and what it opens at forty it could not have opened at twenty. This is not obscurantism; it is a precise claim about where meaning lives. It does not live in the image alone, nor in the interpreter alone, but in the continuing encounter between them.
The practical edge of this is uncomfortable: not-understanding is not a failure state to be corrected, it is the condition under which the symbol continues to work. Tolerating that suspension, staying with the image rather than resolving it into what we already know, is the actual discipline — and the actual difficulty.
C.G. Jung·The Undiscovered Self: With Symbols and the Interpretation of Dreams·1957