Sylvester Johnson For several centuries now, at least, a thriving humanities tradition has been established on the notion that being human is in large measure predicated on the ability to think and reason. In contemplating the nature of human ontology, Rene Descartes (1596–1650) famously quipped that the human subject can be known to exist precisely because of thinking, which requires a thinker as subject—Cogito ergo sum.