As believers, we know we’re called to be salt and light in the world (Matthew 5:13-16). But are you ever discouraged or underwhelmed by what little difference your life seems to make? Are you concerned that your influence as salt and light might not reach very far or go very deep?
In a society obsessed with global impact and political change, it may seem like the life of one believer does not make much of a dent. But our success is not measured in this life. Moreover, it’s not our success to begin with, but God’s, as He works through us to reach His people according to His sovereign timing.
We have not been called to lead sweeping political changes and massive moral reforms, or to turn the world into a theocracy. That’s simply not how the Lord intends us to make a difference in this sinful world. In his book Why Government Can’t Save You, John MacArthur reminds us that the church’s influence is not broadly political, but personal.
The church will really change society for the better only when individual believers make their chief concern their own spiritual maturity, which means living in a way that honors God’s commands and glorifies His name. Such a concern inherently includes a firm grasp on Scripture and an understanding that its primary mandate to us is to know Christ and proclaim His gospel. A godly attitude coupled with godly living makes the saving message of the gospel credible to the unsaved. If we claim to be saved but still convey proud, unloving attitudes toward the lost, our preaching and teaching—no matter how doctrinally orthodox or politically savvy and persuasive—will be ignored or rejected. 
Those words echo Paul’s instructions for godly living in his letter to Titus (Titus 3:1-8). The final chapter of Why Government Can’t Save You is devoted to that passage, and Paul’s vital reminders for living as salt and light in the world.
Remember Your Christian Duties
Paul begins by reminding us of our place in the world—that we are not called to be rebellious revolutionaries, but that we must be humble, meek, and submissive to the authority God has placed over us, and that we need to reflect the character of Christ to the watching world. He writes, “Remind them to be subject to rulers, to authorities, to be obedient, to be ready for every good deed, to malign no one, to be peaceable, gentle, showing every consideration for all men” (Titus 3:1-2).
As John MacArthur explains, such behavior stands out to the world and adorns the gospel:
Consistently demonstrating willing obedience for human authority shows unbelievers that, even though the things of this life are not our primary focus, we still have respect for government and loving concern for other citizens. As Christians, our true citizenship is in heaven (Philippians 3:20), and our main focus must be on holy living and on reaching the lost, because our Lord Himself came “to seek and to save that which was lost” (Luke 19:10). When we do live as God wants us to in an unbelieving culture, that in itself can make the attitude of the lost more receptive to God (1 Peter 2:12). 
As we’ve already discussed in this series, the Lord has not saved us for the purpose of temporal political change. The first key to living holy lives in a pagan culture is to focus on the work of God’s kingdom, and not attempting to build our own.
Remember Your Unsaved Condition
There’s a second mindset believers need to cultivate if they’re going to be salt and light in the world. Rather than giving in to spiritual elitism and looking down on lost and depraved sinners, we need to remember that we were no better than them—and would still be no better—apart from the intervening and transforming work of Christ.
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Source: How to Live in a Pagan Culture