This sanctification is throughout the whole man, yet imperfect in this life; there abides still some remnants of corruption in every part, wherefrom arises a continual and irreconcilable war; the flesh lusting against the Spirit, and the Spirit against the flesh (1 Thess. 5:23; Rom. 7:18, 23; Gal. 5:17; 1 Pet. 2:11). –The 1689 Baptist Confession, ch. 13.2

Ye have heard that it was said by them of old time, Thou shalt not commit adultery: But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart. And if thy right eye offend thee, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell. And if thy right hand offend thee, cut it off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.     –Matthew 5:27-30 (KJV)

Put on the whole armour of God, that ye may be able to stand against the wiles of the devil. For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand. Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness; And your feet shod with the preparation of the gospel of peace; Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked. And take the helmet of salvation, and the sword of the Spirit, which is the word of God.          –Ephesians 6:11-17 (KJV)

John Bunyan, Pilgrim’s Progress.

—. The Holy War.

William Gurnall, The Christian in Complete Armour.

Shannon Ethridge, Every Woman’s Battle.

Stephen Afterburn, Every Man’s Battle.