By analogy with the nature of living beings in this world, regarding which reason must assume as a necessary principle that no organ, no faculty, nothing superfluous, or disproportionate to its use, hence nothing purposeless is to be met with, but rather that everything is to be judged as precisely suitable to its functiona in life, the human being, who alone can contain within him self the ultimate final endb of all this, would have to be the only creature excepted from it.