Second Corinthians 5:6–7 says, "So we are always of good courage. We know that while we are at home in the body we are away from the Lord, for we walk by faith, not by sight" (ESV, emphasis added). Other versions use the word live, rather than walk. The "walk" here is a metaphorical reference to the way a person conducts his or her life. We still use the phrase "all walks of life" to mean a variety of lifestyles or cultures.
The apostle Paul reminds his readers that followers of Christ must not build their lives around things that have no eternal significance. Rather than pursuing the same things the world pursues, a Christian should focus on the unseen realities such as Jesus and heaven. Paul goes on to say, "So whether we are at home or away, we make it our aim to please him. For we must all appear before the judgment seat of Christ, so that each one may receive what is due for what he has done in the body, whether good or evil" (2 Corinthians 5:9–10). Jesus instructed us to store up treasure in heaven (Matthew 6:19–20; Luke 12:33). He promised rewards to everyone who does His will (Matthew 16:27; 1 Peter 1:17; Revelation 22:12) and punishment for those who reject Him (Matthew 25:24–46; John 3:16–18).
Walking by faith means living life in light of eternal consequences. To walk by faith is to fear God more than man; to obey the Bible even when it conflicts with man’s commands; to choose righteousness over sin, no matter what the cost; to trust God in every circumstance; and to believe God rewards those who seek Him, regardless of who says otherwise (Hebrews 11:6).
Rather than loving the things of this world (1 John 2:15–16), Christians should spend their lives glorifying God in everything they do (1 Corinthians 10:31). It requires faith to live this way because we cannot see, hear, or touch anything spiritual. When we base our lives on the truth of God’s Word, rather than on the popular philosophy of our day, we are going against our natural inclinations. Our natural instinct may be to hoard money, but walking by faith says we should give to those in need (Luke 11:41; Ephesians 4:28). Society may say that sexual immorality is acceptable, but those who walk by faith base their standards on God’s unchanging Word, which says any sex outside of marriage is sin (1 Corinthians 6:18; Ephesians 5:3; Galatians 5:19). To walk by faith requires that we tune our hearts to the voice of the Holy Spirit and the truth of His Word (John 10:27; 16:13). We choose to live according to what God reveals to us, rather than trust our own understanding (Proverbs 3:5–6).