But who is our greatest enemy?

(J. C. Philpot, "The Conqueror's Inheritance" 1845)

The pride of our heart,
the presumption of our heart,
the hypocrisy of our heart,
the intense selfishness of our heart,
are often hidden from us.

This wily devil, self, can wear such
masks and assume such forms.

This serpent, self, can so creep and crawl,
can so twist and turn, and can disguise
itself under such false appearances,
that it is often hidden from ourselves.

Who is the greatest enemy we have to fear?

We all have our enemies.

But who is our greatest enemy?

He who you carry in your own bosom—your daily,
hourly, and ever-present companion, that entwines
himself in nearly every thought of your heart—that . . .
  sometimes puffs up with pride,
  sometimes inflames with lust,
  sometimes inflates with presumption, and
  sometimes works under feigned humility and fleshly holiness.

God is determined to stain the pride of human
glory. He will never let self (which is but another
word for the creature) wear the crown of victory.
It must be crucified, denied, and mortified.

Now this self must be overcome. The way to
overcome self is by looking out of self to Him
who was crucified upon Calvary's tree—to receive
His image into your heart—to be clothed with His
likeness—to drink into His spirit—and "receive out
of His fullness grace for grace."