For me, the 'greatest' things I have done are the times when I was open to being an instrument, a time when my own needs and facade were set aside- and something remarkable happened. It happens once in awhile- if only I were able to forget myself more often!
Once at a music party I saw the tension in the shoulders of a woman (who I didn't know) who was sitting on the floor in front of me on the couch. Tapping her on the shoulder, I motioned her to scoot back and let me 'do' her shoulders. Which I did for the next 20 minutes, until the muscles became flat and relaxed.
In a break, she turned her head to me and whispered, Thank you. I was thinking of how to kill myself.