I think, with regards to Jung, we must take a “Spoils of Egypt” approach. During the Exodus, the Israelites brought with them gold, silver and precious gems on their journey out of Egypt. They used these spoils, despite having been already consecrated by the Egyptians for their pagan gods, to gild the ark and create the instruments of the meeting tent and the priest’s breastplate. They took valuable things from other religions and culture and turned them toward the worship of the one true God.
So too, does this concept come into the modern life of the Church. Yes, to accept Jung’s psychological theories wholesale and without question goes against the Church’s teachings. That does not mean, however, that there aren’t gold and gems hidden within Jung’s psychology which can be extracted and turned to the greater glory of God.
It all hinges on a constant discernment. Does this exalt God or demean Him? Does it uplift man to his Creator or demean man’s dignity? When it comes to psychology, we must always have the attitude of a prospector. We must sift out all the obscuring sand, murky water and dangerous jagged rocks before we come to the nuggets of gold lying in the bottom of our pan.
Just like the prospector, if we totally reject Jung we throw out any gold that it contains. If we totally accept Jung, then we are overwhelmed by the worthless sediment in which the gold lies.
It is always in the middle ground that we find the true worth of something.