A mass of pollution, a den of filthiness,
  a seething mass of putrefaction!

Spurgeon, "The Weaned Child" Psalm 131:2.

Pride is the besetting sin of mankind.

Your heart is a mass of pollution, it is a
den of filthiness. Apart from divine grace,
your heart is a seething mass of putrefaction!

If God's eternal Spirit were not to hold it in
check, but to let your nature have its way,
envyings, lustings, murders, and every foul
thing would come flying forth in your daily life.