[2]
And, since the foundation of philosophy
rests on the distinction between good and evil,
I exhaustively treated that subject in five volumes1
and in such a way that the conflicting views of the
different philosophers might be known. Next, and
in the same number of volumes, came the Tusculan
Disputations, which made plain the means most
essential to a happy life. For the first volume
treats of indifference to death, the second of enduring
pain, the third of the alleviation of sorrow, the fourth
of other spiritual disturbances; and the fifth embraces a topic which sheds the brightest light on the
entire field of philosophy since it teaches that virtue
is sufficient of itself for the attainment of happiness.
[p. 373]
1 Definibus bonorum et malorum.
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