See the young Salvation Army convert turning over the lust for drink or sexual satisfaction to the lust to save his fellow-men.

This transformation or sublimation is not the work of reason.

His instinctive life, the main source of conduct, has been directed into a fresh channel of use.
We may now look a little more closely at the character and potentialties of our instinctive life: for this life is plainly of the highest importance to us, since it will either energize or thwart all the efforts of the rational self.

Current psychology, even more plainly than religion, encourages us to recognize in this powerful instinctive nature the real source of our conduct, the origin of all those dynamic personal demands, those impulses to action, which condition the full and successful life of the natural man.

Instincts in the animal and the natural man are the methods by which the life force takes care of its own interests, insures its own full development, its unimpeded forward drive.