PHA~},) then a perception was extracted and produced out of that from
which it originated, such as could be produced from that from which it did
not originate. And we say that this matter was most excellently defined by
Zeno; for how can anything be comprehended, so that you may feel
absolutely sure that it has been perceived and known, which is of such a
character that it is even possible that it may be false? Now when Philo
upsets and denies this, he takes away also all distinction between what is
known and unknown; from which it follows that nothing can be comprehended;
and so, without intending it, he is brought back to the point he least
intended. Wherefore, all this discourse against the Academy is undertaken
by us in order that we may retain that definition which Philo wished to
overturn; and unless we succeed in that, we grant that nothing can be
perceived.

VII. Let us begin then with the senses--the judgments of which are so clear
and certain, that if an option were given to our nature, and if some god
were to ask of it whether it is content with its own unimpaired and
uncorrupted senses, or whether it desires something better, I do not see
what more it could ask for. Nor while speaking on this topic need you wait
while I reply to the illustration drawn from a bent oar, or the neck of a
dove; for I am not a man to say that everything which seems is exactly of
that character of which it seems to be. Epicurus may deal with this idea,
and with many others; but in my opinion there is the very greatest truth
in the senses, if they are in sound and healthy order, and if everything
is removed which could impede or hinder them. Therefore we often wish the
light to be changed, or the situation of those things which we are looking
at; and we either narrow or enlarge distances; and we do many things until
our sight causes us to feel confidence in our judgment. And the same thing
takes place with respect to sounds, and smell, and taste, so that there is
not one of us who, in each one of his senses, requires a more acute
judgment as to each sort of thing.

But when practice and skill are added, so that one's eyes are charmed by a
picture, and one's ears by songs, who is there who can fail to see what
great power there is in the senses? How many things do painters see in
shadows and in projections which we do not see? How many beauties which
escape us in music are perceived by those who are practised in that kind
of accompl