It's not from matching your memories or coming to a better understanding of yourself. There's the idea that therapy is the way to deep knowledge. In most instances, therapy is the way to the shallow end of the pool. People can be helped. But I'm also saying that when they say that, it's proof of nothing, because that kind of belief is built into therapy.
Therapy includes mechanisms to build the client's devotion to the therapy.
The devotion people feel towards therapy is not a defense of therapy. Absolutely well-intentioned, but operating in an environment with very few checks on what they're doing, or what they can do. Their work is highly influenced by the cultural phobias that both they and the client bring with them. It's the people who think they are doing good who have to be watched the closest. Much of psychotherapy is based on accessing and exploring our memories, but most people would admit that memory is a very iffy thing.