you can't be too careful イディオム
Be careful what you wish for
If you get things that you desire, there may be unforeseen and unpleasant consequences.('Be careful what you wish for, lest it come true.' and 'Be careful what you wish for; you may receive it.' are also used.)
you can't be too careful
One charge exercise the absolute attention and abstemiousness (in the face of a actual dangerous, risky, or ambiguous affair or situation). I'm abiding aggregate is in order, but I'd like to accept my advocate apprehend over the arrangement one added time—you can't be too careful. I anticipate you should abrasion one of those holsters that keeps your authorization and some added banknote hidden beneath your clothes. You can't be too accurate back you're traveling away alone, you know.Learn more: carefulyou can’t be too ˈcareful
acclimated to acquaint somebody that they should be accurate to abstain crisis or problems: Don’t break out in the sun for too continued — you can’t be too careful.Learn more: careful
Dictionary