1. _The theory of Pleasure and Pain_. The Stoics agreed with the
Peripatetics (anterior to Epicurus, not specially against _him_) that
the first principle of nature is (not pleasure or relief from pain,
but) _self-preservation_ or _self-love_; in other words, the natural
appetite or tendency of all creatures is, to preserve their existing
condition with its inherent capacities, and to keep clear of
destruction or disablement. This appetite (they said) manifests itself
in little children before any pleasure or pain is felt, and is moreover
a fundamental postulate, pre-supposed in all desires of particular
pleasures, as well as in all aversions to particular pains. We begin by
loving our own vitality; and we come, by association, to love what
promotes or strengthens our vitality; we hate destruction or
disablement, and come (by secondary association) to hate whatever
produces that effect.[8] The doctrine here laid down associated, and
brought under one view, what was common to man, not merely with the
animal, but also with the vegetable world; a plant was declared to have
an impulse or tendency to maintain itself, even without feeling pain or
pleasure. Aristotle (in the tenth Book of the Ethics) says, that he
will not determine whether we love life for the sake of pleasure, or
pleasure for the sake of life; for he affirms the two to be essentially
yoked together and inseparable; pleasure is the consummation of our
vital manifestations. The Peripatetics, after him, put pleasure down to
a lower level, as derivative and accidental; the Stoics went farther in
the same direction--possibly from antithesis against the growing school
of Epicurus.
