A word devoid of thought is a dead thing, and a thought unembodied in words remains a shadow.
Lev S. VygotskyThe child begins to perceive the world not only through his [or her] eyes but also through his [or her] speech
Lev S. VygotskyThere is reason to believe that voluntary activity, more than highly developed intellect, distinguishes humans from the animals which stand closest to them.
Lev S. Vygotsky