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" The word for “fight” in 1 Timothy, agonizesthai, is used repeatedly in describing the Christian life. Jesus said, “Strive to enter through the narrow door. For many, I tell you, will seek to enter and will not be able” (Luke 13:24). Hebrews 4:11 says, “Let us therefore strive to enter that rest, so that no one may fall by the same sort of disobedience.” Paul compares the Christian life to a race and says, “Every athlete strives and uses self-control in all things. They do it to obtain a perishable crown, but we do it to obtain an imperishable one” (1 Cor. 9:25, author’s translation). He describes his ministry of proclamation and teaching in these terms: “For this I toil, struggling with all his energy that he powerfully works within me” (Col. 1:29). And he says that prayer is part of this fight: “Epaphras, who is one of you, a servant of Christ Jesus, greets you, always struggling on your behalf in his prayers” (Col. 4:12). “Strive together with me in your prayers to God on my behalf” (Rom. 15:30). It’s the same word each time: the word for “fight. "
― John Piper , Let the Nations Be Glad!: The Supremacy of God in Missions
