1 And I, brethren, could not speak to you as to spiritual people but as to carnal, as to babes in Christ. 2 I fed you with milk and not with solid food; for until now you were not able to receive it, and even now you are still not able; 3 for you are still carnal. For where there are envy, strife, and divisions among you, are you not carnal and behaving like mere men? (1 Corinthians 3:1–3, NKJV)
One culprit of a weak faith is remaining spiritually undeveloped. Every Christian begins in this immature state as “babes in Christ” (v. 1). The problem of spiritual weakness is staying in that condition. Christ calls us to grow in Him by using God’s word in our lives (1 Pet. 2:2; Heb. 5:12-14). Those who do are the “spiritual” ones; They use God’s revelation to decide their course of conduct (1 Cor. 2:14-16). However, the Corinthians had not grown; they were still carnal (“fleshy”) in thought and practice (v. 1). Such spiritual weakness quickly becomes anti-spiritual (as noted in verse 3). Now, the flesh controlled their minds and choices (see the contrast in 1 Cor. 2:15). We retain the traits and characteristics of the flesh (carnally minded) when we do not grow in our faith (Rom. 8:1, 5-8). Like the Corinthians (engulfed in “envy, strife, and divisions”), spiritual weakness devolves into sin unless arrested by renewing our minds and lives (Rom. 12:1-2; Eph. 4:20-24). Let us not yield to the weakness of the flesh (Matt. 26:41). Instead, be strong in the Lord, using each day to strengthen your faith, cleanse your actions and purify your heart from all defilement of flesh and spirit to grow up in Christ (Matt. 26:41; James 4:8; 2 Cor. 7:1; Eph. 4:15).