One of the most noteworthy features of Schopenhauer's philosophy is, as he himself thought, the acceptance from first to last of Kant's distinction between the 'empirical' and the 'intelligible' character of the individual. Every act of will of every human being follows with necessity as phenomenon from its phenomenal causes; so that all the events of each person's life are determined in accordance with scientific law. Nevertheless, the character empirically manifested in the phenomenal world, while it is completely necessitated, is the expression of something that is free from necessitation. This 'intelligible character' is out of time, and, itself undetermined, manifests itself through that which develops in time as a chain of necessary causes and effects. That this doctrine had been taken up, without any ambiguity as regards the determinism, by Schelling as well as by himself, he expressly acknowledges; and he finds it, as he also finds modern idealism, anticipated in various passages by the Neo-Platonists. His adaptation of it to his doctrine of the Ideas is distinctly Neo-Platonic in so far as he recognises 'Ideas of individuals'; but of course to make Will the essence belongs to his own system. 'The intelligible character,' he says, 'coincides with the Idea, or, yet more precisely, with the original act of will that manifests itself in it: in so far, not only is the empirical character of each man, but also of each animal species, nay, of each plant species, and even of each original force of inorganic nature, to be regarded as phenomenon of an intelligible character, that is, of an indivisible act of will out of time.' This is what he called the '_aseitas_' of the will; borrowing a scholastic term to indicate its derivation (if we may speak of it as derived) from itself (_a se_), and not from a supposed creative act. Only if we adopt this view are we entitled to regard actions as worthy of moral approval or disapproval. They are such not because they are not necessitated, but because they necessarily show forth the nature of an essence the freedom of which consists in being what it is. Yet he could not but find a difficulty in reconciling this with his position that the one universal Will is identical in all things, and in each is 'individuated' only by space and time. For the Ideas, like the thing-in-itself, are eternal, that is, outside of time as well as space; and all the things now enumerated, forces of nature, plant and animal species, and individual characters of men, are declared to be in themselves Ideas.