If this truth that you believe was just taught to you and you didn't even bother to verify then you've already failed, it's part of the human being to try to verify the things you're going to do to see if it's really true and not accept any thing as an absolute truth.

In fact I respect this word of yours many does not know that people are following what comes out from their mouth.

That is why if you respect and know who you are you can just say something from your mouth without verifying it maybe it true or not and the most funnest thing is that some will even take it as serious as any other thing.

However we need verify every word we hear and also hold the one that is the truth though this days people enjoy it when it is lie and like to ignore the main truth