Well it could be used for both
Answer:
They get comfortable with how they do things and lose the urge to push themselves outside of their comfort zones. On the other hand, other teachers never stop pushing themselves to learn new things.
You should let your emotions out. Don't hold them in that only makes it worse... Losing someone you love is very hard and i'm glad you're still here... You should try to vent to someone you trust so you can let everything out. I hope you're okay and i hope you know you're loved.