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2Ti 2:1 You then, my child, be strengthened by the grace that is in Christ Jesus,
2Ti 2:2 and what you have heard from me in the presence of many witnesses entrust to faithful men who will be able to teach others also.
2Ti 2:3 Share in suffering as a good soldier of Christ Jesus.
2Ti 2:4 No soldier gets entangled in civilian pursuits, since his aim is to please the one who enlisted him.
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2Co 10:3 For though we walk in the flesh, we are not waging war according to the flesh.
2Co 10:4 For the weapons of our warfare are not of the flesh but have divine power to destroy strongholds.
2Co 10:5 We destroy arguments and every lofty opinion raised against the knowledge of God, and take every thought captive to obey Christ,
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Eph 6:10 Finally, be strong in the Lord and in the strength of his might.
Eph 6:11 Put on the whole armor of God, that you may be able to stand against the schemes of the devil.
Eph 6:12 For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places.
Eph 6:13 Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand firm.
Eph 6:14 Stand therefore, having fastened on the belt of truth, and having put on the breastplate of righteousness,
Eph 6:15 and, as shoes for your feet, having put on the readiness given by the gospel of peace.
Eph 6:16 In all circumstances take up the shield of faith, with which you can extinguish all the flaming darts of the evil one;
Eph 6:17 and take the helmet of salvation, and the sword of the Spirit, which is the word of God,
Eph 6:18 praying at all times in the Spirit, with all prayer and supplication. To that end keep alert with all perseverance, making supplication for all the saints,

http://www.cyberhymnal.org/htm/h/w/hwhowvbe.htm

He who would valiant be ’gainst all disaster,
Let him in constancy follow the Master.
There’s no discouragement shall make him once relent
His first avowed intent to be a pilgrim.

Who so beset him round with dismal stories
Do but themselves confound—his strength the more is.
No foes shall stay his might; though he with giants fight,
He will make good his right to be a pilgrim.

Since, Lord, Thou dost defend us with Thy Spirit,
We know we at the end, shall life inherit.
Then fancies flee away! I’ll fear not what men say,
I’ll labor night and day to be a pilgrim.
--John Bunyan

The original text from Pilgrim’s Progress:

Who would true valour see,
Let him come hither;
One here will constant be,
Come wind, come weather
There’s no discouragement
Shall make him once relent
His first avowed intent
To be a pilgrim.

Whoso beset him round
With dismal stories
Do but themselves confound;
His strength the more is.
No lion can him fright,
He’ll with a giant fight,
He will have a right
To be a pilgrim.

Hobgoblin nor foul fiend
Can daunt his spirit,
He knows he at the end
Shall life inherit.
Then fancies fly away,
He’ll fear not what men say,
He’ll labor night and day
To be a pilgrim.