ABELARD (1079-1142).-Ethics, 49, 50; the world-soul, 195 (see Scholastics).
ENESIDEMUS (first century).—Scepticism, 110, 111.
AGRIPPA THE SCEPTIC (first century).—Scepticism, 110, 111.
ALBERTUS MAGNUS (1193-1280 A.D.).—On conscience, 50, 51; the soul,
194, 195; matter and mind, 229; on the existence of God, 275 (see
Scholastics).
ALEXANDER OF Aphrodisias (flourished circa 200 A.D.).—The soul, 196.
AMALRIC OF BENA (died circa 1206).—Pantheism, 288.
AMMONIUS SACCAS (circa 175-250 A.D.).—Neo-platonic theory of the soul, 191.
ANAXAGORAS (born circa 500 B.C.).—Scepticism and certitude, 95; matter,
149; mind, 183; matter and mind, 216; theology, 250.
ANAXIMANDER (born 611 B.C.).—The Infinite, 147.
ANAXIMENES (disciple of Anaximander).—The "air," 147, 214.
Anselm, St., of Canterbury (1033-1109).—Faith and reason, 117; proofs
of the existence of God: the ontological argument, 276-278.
ANTIOCHUS OF Ascalon (pupil of Philo of Larissa and a teacher of Cicero).
-Eclecticism, 109.
ANTISTHENES (born 444 B.c.).—Ethics, 29.
AQUINAS, ST. THOMAS (1225-1274).—Ethics, 51; faith and reason, 117;
the soul, 195, 196; the soul and the body, 229; proofs of the exist-
ence of God, 275; criticism of the ontological argument, 278; proof
a contingentia mundi, 279, 280; proof of the first mover, 280; proof
of final causes, 280; the nature of God: creation and Providence,
281-286.
ARCESILAUS (315-241 B.C.).—Probabilism, 105.
ARISTIPPUS OF CYRENE (born circa 435 B.C.).—Ethics, 24.
ARISTON OF CHIOS (flourished circa 260 B.C.).—Ethics, 32.
ARISTOPHANES (born circa 444 B.C.).-Theogony, 247.
ARISTOTLE (384-322 B.C.).—Ethics: happiness and virtue, 16; justice, 20,
21; friendship, 21, 22; the contemplative life, 22, 23; impossibility of
proving everything: intuitive certainty of principles, 99; theory of
matter, 152-154; the soul the formal, efficient, and final cause of the
body, 185; matter and form, 219, 220; the soul and the body, 221;
the veνμa, 222; the potential and the actual, 258-262; proof of the
first mover, 263, 264; the future life: impersonal immortality, 255-259.
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