From my own personal experiences, the most profound, impactful realization I had was in simply seeing my mental state change in an irregular way. It makes you s

From my own personal experiences, the most profound, impactful realization I had was in simply seeing my mental state change in an irregular way. It makes you suddenly aware of all the things you've taken for granted in your mental life that suddenly seem so fluid and malleable. The observation of lots of mental walls suddenly coming down and being free in your own head, that sticks with you.