Looking in the mirror is a big part of Cool Runnings, where Yul Brynner is teaching Junior who he is.
Yule: Look in this mirror and tell me what you see!
Jr: I see Junior.
Yule: Well, here's what I see... I see pride, I see power, I see a bad-ass mother who don't take no crap off-a nobody!

A quick life lesson from a mirror. You are who you perceive yourself to be, as Junior gains self-esteem from this scene, and becomes a stronger and more assertive person because of it.

Mirrors can hold answers.