Answer:
Even though something/someone may look like they are friendly or safe, doesn't make it secure.
Step-by-step explanation:
Just because you see a grenade with its pin pulled out on a battlefield, but it hasn't detonated yet, that doesn't mean it's alright to pick up!
Just because a person asks you to go into their car and they said your mom or dad told them it was alright if you did , that doesn't mean you trust it immediately.
You see what I mean?
Gather your evidence. Scan your surroundings. Be careful. Even if your friends call you superstitious or too cautious. This world is full of crazy people with crazy intentions and you never know what could happen, when.
"Don't judge a book by its cover" also ties in with this, too.)
Hope this helped