The online journal American Scientist says: “Toddlers manage to acquire language even when their parents don’t talk to them directly; deaf children will go so far as to invent their own sign languages if they are not exposed to sign at home. ”
देवाने मानवांना “आकाशातील पक्ष्यांहून अधिक ज्ञान ” दिले आहे, असे ईयोब ३५: ११ मध्ये म्हटले आहे.