A psychologist gave me this at my second assessment, as he felt I have complex trauma from childhood. This is my example, but you can write your own, or adjust this in any way you like, in your own words.
I hope this helps you, and I will talk and write more about this when I get my new computer.
When I was very young, I experienced threats I should not have experienced at a young age. In addition, I assumed I was unsafe in the world around me.
Now I am grown up, I am unsafe no longer.
The bad things have stopped happening for 9 and a half years.
I can now protect myself; I am no longer need to interpret my life as unsafe.
I am safe now!
You can repeat these every day, when you get worried, deeply depressed, or feeling suicidal.