In order to gain a deeper insight into the nature of the world, it is absolutely necessary that we should learn to distinguish the will as thing-in-itself from its adequate objectivity, and also the different grades in which this appears more and more distinctly and fully, i.e., the Ideas themselves, from the merely phenomenal existence of these Ideas in the forms of the principle of sufficient reason, the restricted method of knowledge of the individual.
Munduaren esentziaren ikuspegi sakonago bat izateko ezinbestean beharrezko da nahimena berbaitango gauza eta bere objektitate egokia desberdintzen ikastea, eta gero maila desberdinak, zeinetan hori argi eta perfektuago agertzen baita, ideiak berak eta ideien agerpen soila arrazoiaren printzipioaren taxueretan, zeina baita banakoen ezagutze-era interesatua.