Saul Bellow said this quote

I see that I've become a really bad correspondent. It's not that I don't think of you. You come into my thoughts often. But when you do it appears to me that I owe you a particularly grand letter. And so you end in the warehouse of good intentions: Can't do it now. Then put it on hold. This is one's strategy for coping with old age, and with death--because one can't die with so many obligations in storage. Our clever species, so fertile and resourceful in denying its weaknesses.