The Practice of Psychotherapy CW 16

Consciousness, no matter how extensive it may be, must always remain the smaller circle within the greater circle of the unconscious, an island surrounded by the sea; and, like the sea itself, the unconscious yields an endless and self-replenishing abundance of living creatures, a wealth beyond our fathoming.

We may long have known the meaning, effects, and characteristics of unconscious contents without ever having fathomed their depths and potentialities, for they are capable of infinite variation and can never be depotentiated.

The only way to get at them in practice is to try to attain a conscious attitude which allows the unconscious to co-operate instead of being driven into opposition. ~Carl Jung, CW 16, Para 366