—This Christian warfare is no light matter. Give me your attention and consider what I say;—What saith the Scripture ?—” Fight the good fight of faith, lay hold on eternal life.”—”Endure hardness, as a good soldier of Jesus Christ.”—” 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.”
Strive to enter in at the strait gate.”—”Labour for the meat that endureth unto everlasting life.”—” Think not that I came to send peace on the earth: I came not to send peace but a sword .”—” He that hath no sword, let him sell his garment and buy one.”—” Watch ye, stand fast in the faith, quit you like men, be strong.”— “War a good warfare, holding faith and a good conscience.” Words such as these appear to me clear, plain, and unmistakeable. They all teach one and the same great lesson, if we are willing to receive it. That lesson is, that true Christianity is a struggle, a fight, and a warfare.
J.C. Ryle/William Gurnall – SPIRITUAL WAEFARE