"For the sinful nature desires what is contrary to the Spirit, and the Spirit what is contrary to the sinful nature. They are in conflict with each other, so that you do not do what you want." (Galatians 5:17)

There is a constant struggle between the old nature and the new in every believer's heart. The old nature is very active and loses no opportunity of plying all the weapons of its deadly armory against new-born grace. On the other hand, the new nature is ever on the watch to resist and destroy its enemy. Grace within us will emply prayer, faith, hope, and love to cast out evil. It puts on the "whole armor of God" and wrestles earnestly. These two opposing natures will never cease to struggle so long as we are in this world. With Jesus, who is always with us, the new-born nature is more than a match for its foes. Are you fighting with the adversary today? Are Satan, the world, and the flesh all against you? Do not be discouraged. Fight on! For God Himself is with you. Jehovah Nissi is your banner, and Jehovah Rophi is the healer of your wounds. You will overcome, for who can defeat omnipotence? Fight on, looking to Jesus. Although the conflict may be long and hard, the victory will be sweet. Jesus, the Captain of our salvation, assures us that we will eventually become more than conquerors through Him who loves us.

(Charles Spurgeon, Morning by Morning)