Carl Jung, on the Effect of Projection and The Tarot

In short what you see in other people, situations, and even a tarot card is who you are, even if you cannot recognise and fear it.

The effect of projection is to isolate the subject from his environment, since instead of a real relation to it there is now only an illusory one. Projections change the world into the replica of one’s own unknown face. In the last analysis, therefore, they lead to an autoerotic or autistic condition in which one dreams a world whose reality remains forever unattainable
The resultant sentiment d’incomplétude and the still worse feeling of sterility are in their turn explained by projection as the malevolence of the environment, and by means of this vicious circle the isolation is intensified. The more projections are thrust in between the subject and the environment, the harder it is for the ego to see through its illusions. A forty-five-year-old patient who had suffered from a compulsion neurosis since he was twenty and had become completely cut off from the world once said to me: “But I can never admit to myself that I’ve wasted the best twenty-five years of my life!”
It is often tragic to see how blatantly a man bungles his own life and the lives of others yet remains totally incapable of seeing how much the whole tragedy originates in himself, and how he continually feeds it and keeps it going. Not consciously, of course for consciously he is engaged in bewailing and cursing a faithless world that recedes further and further into the distance. Rather, it is an unconscious factor which spins the illusions that veil his world. And what is being spun is a cocoon, which in the end will completely envelop him.

Collected Works 9.2
Paragraphs 17 -18