Q.E.D.
Note .-- As pleasure is generally (IV.xliv.

note) attributed to one part of the body, we generally desire to preserve our being with out taking into consideration our health as a whole: to which it may be added, that the desires which have most hold over us (IV.

ix.) take account of the present and not of the future.
PROP.LXI.

Desire which springs from reason cannot be excessive.
Proof .-- Desire (Def.

of the Emotions, i.) considered absolutely is the actual essence of man, in so far as it is conceived as in any way determined to a particular activity by some given modification of itself.