Book, Paragraph

 1 III, 1  |         is supposed by those who believe both in Forms and in mathematical
 2 III, 2  |      sensible. Yet how are we to believe in these things? It is not
 3  IV, 3  |        impossible for any one to believe the same thing to be and
 4  IV, 3  |          he does not necessarily believe; and if it is impossible
 5  IV, 3  |          man at the same time to believe the same thing to be and
 6  IV, 5  |       again we shall ask them to believe that among existing things
 7 XII, 10 | principle, and so must those who believe in the Forms; for why did
 8 XIII, 6 |          the Pythagoreans, also, believe in one kind of number-the
 9 XIII, 9 |         but as regards those who believe in the Ideas one might survey
10 XIII, 10|     difficulty both to those who believe in the Ideas and to those
11 XIV, 2  | mathematical number, why must we believe his statement that such