Inertia is a synonym of inactivity
This poem is about how Louis Simpson is looking for loved one. Through out the entire text he expresses his loss for hope and courage, questioning whether not he should live and love of his departed, and he has tremendous fears of losing his precious memories of his loved one.
Opinions are just what someone thinks, but interpretations are the fact.
Dear friend (whatever name you want), I want to send my deepest condolences to you and your family during this time. Your mother was an amazing woman and she will truly be missed. If there’s anything you need i’m here for you.