internal, can arrest this, its natural course.

When you were younger, the feelings which I now warn you against were
called jealousy, and even now some indulgent friends may continue to
give them this false name. Do not you suffer the dangerous delusion!
Have the courage to place your feelings in all their natural deformity
before you, and this sight will give you energy to pursue any regimen,
however severe, that may be required to subdue them.

I do really believe that it is the false name of jealousy that prevents
many an early struggle against the real vice of envy. I have heard young
women even boast of the jealousy of their disposition, insinuating that
it was to be considered as a proof of warm feelings and an affectionate
heart. Perhaps genuine jealousy may deserve to be so considered: the
anxious watching over even imaginary diminution of affection or esteem
in those we love and respect, the vigilance to detect the slightest
external manifestation of any diminution in their tenderness and regard,
though proving a deficiency in that noble faith which is the surest
safeguard and the firmest foundation of love and friendship, may, in
some cases, be an evidence of affection and warmth in the disposition
and the heart. So close, however, is the connection between envy and
jealousy, that the latter in one moment may change into the former. The
most watchful circumspection, therefore, is required, lest that which
is, even in its best form, a weakness and an instrument of misery to
ourselves and others, should still further degenerate into a meanness
and a vice;--as, for instance, when you fear that the person you love
may be induced, by seeing the excellences of another, to withdraw from
you some of the time, admiration, and affection you wish to be
exclusively bestowed upon yourself. In this case, there is a strong
temptation to display the failings of the dreaded rival, or, at the
best, to feel no regret at their chance display. Under such
circumstances, even the excusable jealousy of affection passes over into
the vice of envy. The connection between them is, indeed, dangerously
close; but it is easy to trace the boundary line, if we are inclined to
do so. Jealousy is contented with the affection and admiration of those
it loves and respects; envy is in despair, if those whom it despises
bestow the least portion of attention or admiration on those whom
perhaps she despises still more. Jealousy inquires only into