From these general characteristics, the others which James points out logically follow. The positivist is a sensualist, giving greater value to the specific realm of the senses than to reflection which transcends it. He is a materialist and a pessimist, for he knows only too well the hopeless uncertainty of the course of things. He is irreligious, not being in a state to hold firmly to the realities of the inner world as opposed to the pressure of external facts; he is a determinist and fatalist, only able to show resignation; a pluralist, incapable of all synthesis; and finally a sceptic, as a last and inevitable consequence of all the rest. The expressions, therefore, used by James, show clearly that the diversity of types is the result of a different localisation of the libido; this libido is the magic power in the depth of our being, which, following the personality, carries it sometimes towards internal life, and sometimes towards the objective world. James compares, for example, the religious subjectivism of the idealist, and the quasi-religious attitude of the contemporary empiricist: "Our esteem for facts has not neutralised in us all religiousness. It is itself almost religious. Our scientific temper is devout."[186] A second parallel is furnished by Wilhelm Ostwald,[187] who divides "savants" and men of genius into classics and romantics. The latter are distinguished by their rapid reactions, their extremely prompt and abundant production of ideas and projects, some of which are badly digested and of doubtful value. They are admirable and brilliant masters, loving to teach, of a contagious ardour and enthusiasm, which attracts many pupils, and makes them founders of schools, exercising great personal influence. Herein our type of extroversion is easily recognised. The classics of Ostwald are, on the contrary, slow to react; they produce with much difficulty, are little capable of teaching or of exercising direct personal influence, and lacking enthusiasm are paralysed by their own severe criticism, living apart and absorbed in themselves, making scarcely any disciples, but producing works of finished perfection which often bring them posthumous fame. All these characteristics correspond to introversion.