People are the same.
A good man keeps good things in his mind.
In his life, he brings those good things out from there.
But a bad man keeps bad things in his mind.
He brings those bad thoughts out from there.
It is like things that he brings out of a room where he keeps them.
When a person speaks, his words show what is really in his mind.’
Luke 6:45 NASB
The good man
out of the good treasure of his heart
brings forth what is good;
and the evil man
out of the evil treasure
brings forth what is evil;
for his mouth speaks
from that which fills his heart.