Heart and Brain

My father’s death was from his heart, My mother’s from her brain And so I wonder which, for me, Might just be on the wane. Of course, there is no guarantee That I will follow suit, For in the future, we all know There is no absolute. So far, my heart is ticking fine And even with some quirks, My brain, despite some CRS,* Apparently still works. *Can’t remember spit (or its rhyming improvement)