This describes the Christian's posture in his fight against Satan. It is a military expression, a word of command that a captain would use to his soldier. A coward does not stand, but Christ directs us to stand our ground to stoutly repel the enemy. Uriah stood in the face of death. He did not dispute with his General; obey he must, though he lost his life. To resist some temptations may cost us dear. The Roman captain said it was necessary to sail, not to live. The soldier carries his prince's honour with him into the field. How unworthy it is to expose the name of God to reproach to avoid the little scorn, temporal loss, or trouble! Truly, God is not careless with the blood of his servants, yet sometimes he tries their loyalty in hard service and sharp temptations, that he may from their faithfulness and holy stoutness in their suffering for him triumph over Satan. God furnishes armour for us to stand. Stand, and the day is ours; flee, and all is lost. There is no armour for the back in God's armoury. Stand, and the bullets fall; flee, and they enter your heart. He that stands believing, comes off with his life. He that recoils and runs from his colours, God will have no pleasure in him. There is comfort in striving against sin and Satan, though through blood. Would you not rather die in the field for your Prince, than by the axe for cowardice or treachery? Satan is a cowardly enemy. He is discouraged when he finds the soul awake to oppose him. He fears and trembles at your faith. Pray for help against him, and vigorously reject the motions he makes, and he will run (James 4:7). He cannot hurt us without our consent. When we resist, his heart fails and he leaves. If we only weakly resist, he continues his assault. The only way to be rid of him is to shut the door upon him and deny all discourse with him.
William Gurnall, The Christian in Complete Armour, I:275-278 +