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come and go; but the detection of fallacies, the framing of definitions,
the invention of methods still continue to be the main elements of the
reasoning process.

Modern philosophy, like ancient, begins with very simple conceptions. It
is almost wholly a reflection on self. It might be described as a
quickening into life of old words and notions latent in the semi-barbarous
Latin, and putting a new meaning into them. Unlike ancient philosophy, it
has been unaffected by impressions derived from outward nature: it arose
within the limits of the mind itself. From the time of Descartes to Hume
and Kant it has had little or nothing to do with facts of science. On the
other hand, the ancient and mediaeval logic retained a continuous influence
over it, and a form like that of mathematics was easily impressed upon it;
the principle of ancient philosophy which is most apparent in it is
scepticism; we must doubt nearly every traditional or received notion, that
we may hold fast one or two. The being of God in a personal or impersonal
form was a mental necessity to the first thinkers of modern times: from
this alone all other ideas could be deduced. There had been an obscure
presentiment of 'cognito, ergo sum' more than 2000 years previously. The
Eleatic notion that being and thought were the same was revived in a new
form by Descartes. But now it gave birth to consciousness and self-
reflection: it awakened the 'ego' in human nature. The mind naked and
abstract has no other certainty but the conviction of its own existence.
'I think, therefore I am;' and this thought is God thinking in me, who has
also communicated to the reason of man his own attributes of thought and
extension--these are truly imparted to him because God is true (compare
Republic). It has been often remarked that Descartes, having begun by
dismissing all presuppositions, introduces several: he passes almost at
once from scepticism to dogmatism. It is more important for the
illustration of Plato to observe that he, like Plato, insists that God is
true and incapable of deception (Republic)--that he proceeds from general
ideas, that many elements of mathematics may be found in him. A certain