Such were (as far as our imperfect evidence goes) the ethical and emotional views of the Kyrenaic school: their theory and precepts respecting the plan and prospects of life. In regard to truth and knowledge, they maintained that we could have no knowledge of anything but human sensations, affections, feelings, &c. ([Greek: pa/thê]): that respecting the extrinsic, extra-sensational, absolute, objects or causes from whence these feelings proceeded, we could know nothing at all. Partly for this reason, they abstained from all attention to the study of nature--to astronomy and physics: partly also because they did not see any bearing of these subjects upon good and evil, or upon the conduct of life. They turned their attention mainly to ethics, partly also to logic as subsidiary to ethical reasoning.[214] [Footnote 214: Diog. L. ii. p. 92. Sextus Empiric. adv. Mathemat. vi. 53.] Such low estimation of mathematics and physics and attention given almost exclusively to the feelings and conduct of human life--is a point common to the opposite schools of Aristippus and Antisthenes, derived by both of them from Sokrates. Herein Plato stands apart from all the three. The theory of Aristippus, as given above, is only derived from a meagre abstract and from a few detached hints. We do not know how he himself stated it: still less how he enforced and vindicated it.--He, as well as Antisthenes, composed dialogues: which naturally implies diversity of handling. Their main thesis, therefore--the text, as it were, upon which they debated or expatiated (which is all that the abstract gives)--affords very inadequate means, even if we could rely upon the accuracy of the statement, for appreciating their philosophical competence. We should form but a poor idea of the acute, abundant, elastic and diversified dialectic of Plato, if all his dialogues had been lost--and if we had nothing to rely upon except the summary of Platonism prepared by Diogenes Laertius: which summary, nevertheless, is more copious and elaborate than the same author has furnished either of Aristippus or Antisthenes. [Side-note: Doctrines of Antisthenes and Aristippus passed to the Stoics and Epikureans.]