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2 Timothy 2:3

The Christian is a self-sacrificing man as the solider must be. To protect his own country the solider must expose his own self; to serve his king he must be ready to lay down his life. Sure he is no Christian who never felt the spirit of self sacrifice. If live unto myself, I am living unto the flesh, and of the flesh I shall reap corruption. Only he who lives to his God, to Christ, to the truth, to the church and to the good old cause, only he is the man who can reckon himself at all to be a solider of Jesus Christ. A solider is a serving man. He does not follow his own pleasure; he is under law and rule; each hour of the day has its prescribed duty; he must be obedient to the word of another and not to his own will and whim. Such is the Christian. We serve the Lord Jesus Christ. Though no longer the slaves of man so as to dread his frown, we are servant of Christ who has loosed our bonds. The solider is often a suffering man. There are wounds, toils, and frequent lyings in the hospitals; there may be many ghastly cuts which let the soul out with the blood.
Such the Christian solider must be, ready to suffer, enduring hardness, not looking for pleasure of the worldly kind in this life, but counting it his pleasure to renounce his pleasure for Christ's sake. Once again the true solider is an ambitious man. He pants for honor and seeks for glory. On the field of strife he gathers his laurels, and amidst a thousand dangers he reaps renown. The Christian is fired by higher ambitions than earthly warriors ever knew. He sees a crown that can never fade; he loves a King who best of all is worthy to be served; he has a motive within him which moves him to the noblest deeds, a divine spirit impelling him to the most self-sacrificing actions. Thus you see the Christian is a solider, and it is one of the main things in the Christian life to 'earnestly contend for the faith' and to fight with valor against sin.
-Spurgeon