The sword which wounds the red dragon!

(Thomas Watson, "The Lord's Prayer")

"In every situation take the shield of faith, and
 with it you will be able to extinguish the flaming
 arrows of the evil one!" Ephesians 6:16

No grace more bruises the serpent's head—than faith.
It is both a shield and a sword, defensive and offensive.
It is a shield to guard the head and defend the vitals.
The shield of faith prevents the fiery darts of temptation
from piercing us through. Faith is also the sword which
wounds the red dragon!

How does faith come to be so strong—that it can resist
Satan and put him to flight?

Because faith brings the strength of Christ into the soul.
Samson's strength lay in his hair—ours lies in Christ. If a
child is assaulted—it runs and calls to its father for help.
Just so, when faith is assaulted, it runs and calls Christ,
and in His strength overcomes!