I think acceptance of things we cannot or could not control is all about grieving the loss of control or loss of power to change whatever it is (was). For me, that means I can talk about it, express all the emotions I feel (anger, sadness, regret, guilt, more anger, etc), and have those feelings validated and allowed to just be. And if I have to revisit things multiple times, it's perfectly ok with my therapist. For me, it's all about all of my feelings being heard and validated. It doesn't take long until I am able to move on because I feel like my pain and feelings have been heard. Occasionally, I also get gentle reminders that ultimately we are only in control of ourselves and how we react to things that happen. But it's not as easy as just telling yourself to "accept it because it can't be changed." I wish it were that simple and easy! My mind doesn't work like that, or I wouldn't be in therapy! ;-)