Four is an ancient symbol of completeness; wholeness. (The four comers of the earth, the four cardinal points, the four winds all, in primitive traditions, represent the whole of reality. So does a four-sided figure. The cross, too, extending in all four directions, is an ancient - pre-Christian - symbol of totality. Such figures, along with a four- petalled flower or four-lobed leaf, are mandalas, representing wholeness.)
According to Jung, consciousness has four functions: thinking, intuition, feeling and sensation. Usually, however, at least one of these and possibly three are undeveloped and are therefore still totally or partially unconscious. Personal fullness can be achieved only by lifting these functions out of unconsciousness and integrating them into consciousness.
Multiples of four - eight, sixteen and so on - may have the same symbolic meaning as four. To see such a symbol in your dream does not mean you have achieved personal wholeness; rather, your dream may be pointing out, by contrast, your lack of wholeness.... A Dictionary of Dream Symbols