Be most intent upon increasing the foundation-graces, such as the knowledge of God, the understanding of his Word, believing the truth of the gospel, a realizing sense of a future state of rewards and punishments. Labor to get your heart all enflamed with love to God and abased by humility and a sense of your own unworthiness. These are the foundation-graces, and as these are increased, all other graces will most certainly increase proportionably.The Christian life is earnest, strenuous effort. But it is effort flowing from 'the foundation-graces'--knowing God, understanding His Word, believing the gospel, knowing our unworthiness.
And all these things you must do with the utmost diligence and application of mind. The work of a Christian is compared to running, and wrestling, and fighting, and those exercises which require the greatest labor. (Works, Yale ed., 14:277)
We wage warfare by knowing that the war is over. The main weapon is our peace.
Fight, fight with all your might, with the gospel.
As Paul told Timothy: '. . . wage the good warfare, having faith. . . .' (1 Tim 1:18-19)