Agnosticism is the view that the truth values of certain claims – especially metaphysical and religious claims, such as whether God, the divine, or the supernatural exist – are unknown and perhaps unknowable. According to the philosopher William L. Rowe, "agnosticism is the view that human reason is incapable of providing sufficient rational grounds to justify either the belief that God exists or the belief that God does not exist". Agnosticism is a doctrine or set of tenets rather than a religion as such.