Everything happens for a reason
This is the truest statement I know. The reason it is something I've learned is because of how true it is when you look at the past. Those things you thought were just horrible, were for a reason.
That toy you weren't allowed to have. It wasn't really worth it.
That breakup that hurt so bad. You were better off without him/her.
That friend you made. Turned out to be the best friend you ever had.
That book a teacher forced you to read that you later came to appreciate.
The hardest decision you knew was right, but didn't want to make. You made it anyway and are thankful.