When I eat the foods to which my body is adapted, I take in the nutrients and eliminate the rest. When I eat something that I was not designed to ingest, my liver chugs through the toxins as best it can, but some remain, deposited inside, unusable, festering, harmful.
My thoughts work the same way. Healthy ones flow easily, in and out. Toxic ones fester. My brain tries to purge them, but a few always seem to stay.
Bad thoughts will eat away at my quality of life, but only if I let them. It’s not that I yearn for bliss. Rather I want good mental health, achieved by keeping it all in perspective, by remaining forever alert for the positive angle. No actions help me do that more than time spent in the woods.