This is not groundbreaking to anyone else, but a couple of weeks ago, I had my own little epiphany.
To experience true peace, the peace that surpasses all understanding, one must do three things:
1) Forgive. And I mean truly forgive, and I mean everyone.
2) Detach. Detach from all earthly, creaturely things so as to attach to God.
3) Accept. Accept all joys and sufferings as if they came to you from the Hand of God.
No, it is not easy, but yep, it is just that simple.