I can think of a couple.

One with my T, where she said it was OK to feel unhappy about my childhood, even though many people had it way worse. I had needs that I didn't get met (help/understanding with my OCD, anxiety, and depression), so it's like there was something missing. It felt like I had permission to feel bad about it and a bit angry at my parents for making me feel like there was something wrong with me rather than trying to help.

With my marriage counselor, one "magic moment" was maybe 6 months ago, when we were talking about my not feeling like I get what I need from my H. And MC paused and had this look like a light bulb went off, then said to me, "Do you ever just feel like there's this void inside of you that no one can really fill?" And I thought about it for a minute and said, "Actually, yeah I do kinda feel that way." (He then talked about how it came from the past, like childhood, and it was up to me to fill it, but that he and T would help me figure out how to do that.)

And there was also the moment over a year ago where I was crying hysterically while trying to talk to MC, and I was like, "I'm sorry." The way he looked at me and the voice he used when he said "It's OK" felt very comforting and healing. I felt very connected to him and understood in that moment. It's something I replay in my mind when I'm having a rough time or am scared.