We have a tendency to forget every good thing God has done for us. When we face new challenges we often do not remember our deliverance from old ones.
When David stood before Goliath, he rehearsed his past victories in order to build up his faith. He recounted, "And David said unto Saul, Thy servant kept his father's sheep, and there came a lion, and a bear, and took a lamb out of the flock: And I went out after him, and smote him, and delivered it out of his mouth: and when he arose against me, I caught him by his beard, and smote him, and slew him. Thy servant slew both the lion and the bear: and this uncircumcised Philistine shall be as one of them, seeing he hath defied the armies of the living God” (1 Samuel 17:34-36).
Moses reminded Israel of all their past deliverances and then he warned them: "Take heed to thyself, and keep thy soul diligently, lest thou forget the things which thine eyes have seen, and lest they depart from thy heart all the days of thy life: but teach them thy sons, and thy sons' sons" (Deuteronomy 4:9).
The Bible says of Israel: "They kept not the covenant of God . . . and forgot his works, and his wonders that he had shewed them" (Psalm 78:10-11). Like the Israelites, we have the same tendency whenever we face a new trial or affliction. We say, "Oh, God, this time it's too much for me to face." But God answers, "Simply look back and remember Me!"
If need be, keep a journal to remind yourself of God's great deliverances in your life. Jot down a few notes at night before going to bed. Do whatever it takes to remind yourself of all the things He has done for you, all the heartaches you have been through and the deliverance He brought. Then, when your next affliction arises, open your notebook and say to the devil, "You're not going to deceive me this time. My God brought me out before, and He will do it again."