Do not believe in anything simply because you have heard it. Do not believe in anything simply because it is spoken and rumored by many. Do not believe in anything simply because it is found written in your religious books. Do not believe in anything merely on the authority of your teachers and elders. Do not believe in traditions because they have been handed down for many generations. But after observation and analysis, when you find that anything agrees with reason and is conducive to the good and benefit of one and all, then accept it and live up to it.
Budhha
Chronicle of Link 
Nu știam sursa. Eu auzisem [auzisem!] o variantă trunchiată de înțelepciune americană:
Din ceea ce ți se spune să nu crezi nimic, iar din ceea ce vezi doar 50%!
ca replică la mass-media contemporană.
Exista mai multe variante ale citatului, dar toate exprima cam aceiasi idee.
Foarte adevarata si zicala americana.