I think it takes a very mature and strong mind to practice gratitude in the middle of a storm like the one you are facing. Regarding the German philosopher whose name you don't remember, it is Martin Buber with his famous relational philosophy of Ich und Du (I and Thou). And about that, you are completely right: we don't exist in a vacuum, and even more, our blessings carry the responsibility of how we impact others. Additionally, I also loved the way you managed to connect this with the great Marcus Aurelius. Cultivating the mind and personal growth is the only thing that no one can take away from us, even when we are affected on an emotional level. This is my opinion on the matter.