[55] Substantia unius attributi non nisi unica existit, et ad ipsius naturam pertinet existere. Erit ergo de ipsius natura vel finita vel infinita existere. At non finita. Nam deberet terminari ab alia eiusdem naturæ, quæ etiam necessario deberet existere; adeoque darentur duæ substantiæ eiusdem attributi, quod est absurdum. Existit ergo infinita; q. e. d.—Ethices, Pars prima; VIII. Omnis substantia est necessario infinita. Leipzig, 1875, p. 84.
[56] Locke's Essays, Philadelphia, 1846, p. 415, et seq.
[57] "A Treatise Concerning the Principles of Human Knowledge," §§ 123-132. Ed. Fraser, Vol. I, pp. 220-225.
[58] §§ 45-48, pp. 178-180.
[59] "Principles," §3, p. 157.
[60] "A System of Logic," Book I, Chap. III, § 11, N. Y., 1882, p. 62.
[61] "First Principles," Part 1, Chap. IV, § 26, N. Y., 1888, pp. 93-97.
[62] "First Principles." Chap. V, § 27, p. 99.
[63] "Principles of Psychology," Part VII, Chap. VI, N. Y., 1883, Vol. II, p. 369.
[64] "First Principles," Part I, Chap. III, § 15, ed. cit. p. 49.