Sometimes, Pisces, people who come off as "know-it-alls" don't have a clue.
They speak with bravado and insist they are right, and they may even believe
it. This may be due to an oversized ego, but it could also be because of
insecurity. Someone you may be dealing with now could "know it all" about
something you're involved with. You are discerning enough to know this isn't
true, but pointing it out might be pointless, and maybe even damaging. You
know what you need to know, so just be grateful for that. Pointing out this
person's deficiency may be temporarily satisfying, but in the end, you'll
only wind up feeling sorry for them.