The power which Socrates possessed of rousing other minds to independent activity and apostolic transmission of spiritual gifts was, as we have said, the second verification of his doctrine. Even those who, like Antisthenes and Aristippus, derived their positive theories from the Sophists rather than from him, preferred to be regarded as his followers; and Plato, from whom his ideas received their most splendid development, has acknowledged the debt by making that venerated figure the centre of his own immortal Dialogues. A third verification is given by the subjective, practical, dialectic tendency of all subsequent philosophy properly so called. On this point we will content ourselves with mentioning one instance out of many, the recent declaration of Mr. Herbert Spencer that his whole system was constructed for the sake of its ethical conclusion.101