Let any one examine his own thoughts, and he will find that as soon as he supposes or speaks of essential, the consideration of some species, or the complex idea signified by some general name, comes into his mind; and it is in reference to that that this or that quality is said to be essential.
Nork bere pentsamenduak aztertuz gero aurkituko du ezen, esentziala suposatu eta hartaz mintzatzen hasi bezain laster, espezieren baten gogorapena edo izen orokorren batek adierazitako ideia konplexua datorkiola gogamenera, eta honexekiko erreferentzian hain zuzen esaten da koalitate hori edo bestea esentziala dela.