you shouldn't form an opinion on someone or something based purely on what you see on the outside
"She may look serious, but don't judge a book by its cover."
Do not procrastinate; take advantage of the present moment.
to signal someone to stop, especially a vehicle
To exert effort or work hard at something.
to be extremely generous and selfless
a cyberattack that occurs before a vulnerability is patched
to take back what you said