This makes too much sense:

The soul is dyed the color of its thoughts. Think only on those things
that are in line with your principles and can bear the light of day.
The content of your character is your choice. Day by day, what you
choose, what you think, and what you do is who you become. Your
integrity is your destiny … it is the light that guides your way.

– Heraclitus (?535BC-475BC) Greek Philosopher