Pointers from Robert Adams:
The first thing to understand is that everything that has transpired in your life has been necessary. No matter how it looks, no matter what has happened, everything has been necessary.
The second thing to understand is, everything has been preordained. In other words, everything was supposed to happen the way it happened. There were no mistakes.
The third thing to understand is that the first two things are all a pack of lies, for these things do not even exist in Reality.