I was profoundly moved by this podcast, which is on the Torah portion of "Vayikra", which means to be called.
Listen to the whole thing and/or read it.
It's one of his best, and that's saying a lot because pretty much every week's commentary is filled with gems.
Anyone who has struggled with their calling, or wondered what their calling was, or even why they are doing certain things, or what their calling in fact is, will find something meaningful in this essay.