It is a deep knowledge. No matter what happens in the external circumstances, you feel exactly this fulfillment.
You don't have questions anymore, "why...?" "if..." "what if...?" "should I..." "hadn't I...." to torment you.
You don't feel its agony.
You don't "fight" it anymore.
You are what you are and "it" is what it is and you can accept "it" as it is and you can accept yourself within it and you don't want to adapt yourself to it and you don't want to adapt "it" to yourself.
You are quiet about it.
You can let go.
I wish you all the best