Because if your mind tries to convince you you're incapable of something, and you believe it, then like those two toddlers, you'll begin to feel helpless and you'll stop trying too soon, or you won't even try at all.
Ukoliko vas um pokušava uvjeriti da nešto ne možete napraviti, a vi mu povjerujete, poput ona dva djeteta, počet ćete se osjećati bespomoćno i prebrzo prestati pokušavati  ili više uopće nećete ni pokušavati.