For my job right now, the most rewarding thing is just working with the autistic children in general! Whenever they write out a sentence, or read a whole book, or converse with me I feel elated. I'm working with the same student this summer as I was last summer and he's using so many more words this year, I'm so proud of him.
And we sang a song before swim therapy yesterday, and he actually sang along with me, following the sequence of actions that the song was asking without a prompt from me. That is rewarding.
For my other job, at the deli, it's rewarding when I'm told that I make the best damn sandwiches.
And for my OTHER job, as a writing tutor, it's rewarding when I have my clients tell me I taught them better than their own professors after a long session of editing and writing lessons.