A mirror shows your external: the dress you wear, your hairstyle, skin color, and et all. The outward representation of self is just one part of us.
The other hidden us beyond the mirror is our thoughts. Our thoughts play a key role in shaping who we are. It is less plastic or pretentious.
We can wear or makeup in front of the mirror, society, and pretend. We cannot lie to ourselves. Our thoughts will make us go nuts.
To cultivate thoughts, it requires observation with self and our relationship with externals.
Cultivate honest thoughts instead of pretending in front of the mirror.