You know how you can be energized by a good physical workout? You wake up and feel better after a walk? It's the same emotionally with people. New ideas and "good" things happening energize us, a good problem to work on, say, a client's/patient's issues

can get one excited and give one energy!
Yes it can be exhausting working on our problems because we're trying to carve a tunnel through rock. But once we do, think of what we have and have learned? We have trains running to and fro and great communications and resources. Get those lettuces moving from California to New Jersey, struggling!