think long and hard

To give very careful and thorough consideration (to something). You had better think long and hard before you say your next words, because you are on thin ice, mister. I thought long and hard about what colleges I want to apply to—it wasn't just a rash decision.

See also: and, hard, long, think

See also:

think long and hard before (doing something)
think long and hard before (one) (does something)
go in(to something) with an open mind
with an open mind
an open mind
open mind
be careful
if you can't be good, be careful
know what (one) is talking about
know what you're talking about

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