For me, a few come to mind:

• "You're imagining everybody in this story way more attractive than they actually were."

It was posted somewhere on one of those spicy subreddits under some affair threesome story. And it sort if clicked with me. Like look around, normal people on the street don't all look like supermodels. And supermodels don't lurk around in reddit comment sections. It really put things into perspective for me.

• "Life isn't short, it's the longest thing you'll ever do."

It is a bit uplifting to realize that no matter if you have bad or good period in your life, it is only a short chapter contained in the longest time period possible for you to experience.

There were a few others that I probably can't remember of the top of my head right now.