Two things significantly distinguish human beings from the other animals; an interest in the past and the possibility of language. Brought together they make a third: Art. The invisible city not calculated to exist. Beyond the lofty pretensions of the merely ceremonial, long after the dramatic connivings of plitical life, like it or not, it remains. Time past eternally present and undestroyed.
Other animals can make sounds, and sounds can indicate pleasure and pain. But language, a distinctly human capacity, isn´t just for registering pleasure and pain. It´s about declaring what is just and what is unjust, and distinguishing right from wrong. We don´t grasp these things silently, and then put words to them; language is the medium through which we discern and deliberate about the good.
The limits of my language mark the limits of my world.
See John Stuart Mill {618823} for a related earlier quotation.
It was a profound saying of Wilhelm Humboldt, that 'Man is man only by means of speech, but in order to invent speech he must be already man.'
I think the one thing humans are is language wizards.
In what else, pray, does man differ from the other animals except in that he is used by words?
I haven't seen any claim that Piraha lacks recursion, that is, that there are a finite number of sentences or sentence frames. If that's so, it would mean that the speakers of this language aren't making use of a capacity that they surely have, a normal situation; plenty of people throughout history would drown if they fall into water.
I did not say that language as a completed system emerged in an individual in an instant. But I cannot think of a coherent alternative to the idea that mutations take place in individuals, not communities, so that whatever rewiring of the brain yielded the apparently unique properties of language, specifically recursive generation of hierarchically structured expressions, would therefore have taken place in an individual, and only later been used among individuals who had inherited this capacity.
The sum of human wisdom is not contained in any one language, and no single language is capable of expressing all forms and degrees of human comprehension.
No one seriously doubts that if Piraha children are brought up in Boston they'll be speaking Boston English, that is, that the capacities are present, unlike other animals, as far as is known. There's no challenge to the theory - not mine, but everyone's - that the human language faculty provides the means for generation of an infinite array of structured expressions.