"Whoever walks with the wise becomes wise, but the companion of fools will suffer harm."
â Proverbs 13:20
Quick Answer
The Bible warns that bad company corrupts good character (1 Corinthians 15:33) and that walking with the wise makes one wise, while companions of fools suffer harm (Proverbs 13:20). Choosing friends who love God and speak truth is a wisdom decision that shapes your character over a lifetime.
Friendship Shapes You Whether You Notice or Not
Nobody sets out to become a worse version of themselves through friendship, yet it happens gradually, almost invisibly, through years of small influences: what jokes become normal, what gossip feels acceptable, what compromises start looking minor. Scripture takes this seriously, treating the choice of close friends as a genuine wisdom decision, not a small or neutral one (Proverbs 27:17).
This does not mean isolating from anyone who isn't a mature believer; Jesus Himself was known as a friend of sinners, eating with tax collectors and people of poor reputation in order to reach them (Matthew 9:10-11, Luke 7:34). But there is an important difference between reaching out to build a bridge and choosing someone as a close, formative companion who shapes your daily character.
The Company You Keep Corrupts or Cultivates
Paul warns plainly, do not be deceived: bad company ruins good morals (1 Corinthians 15:33). This warning assumes influence flows naturally in close relationships, whether we intend it or not, and that good intentions alone rarely protect someone consistently immersed in bad influences. Character is caught as much as taught.
Proverbs states the positive side just as clearly: whoever walks with the wise becomes wise, but the companion of fools will suffer harm (Proverbs 13:20). Friendship functions like a slow current, carrying you gradually toward whatever direction your closest companions are already moving, toward wisdom or toward folly.
Warnings Against Certain Kinds of Companions
Proverbs specifically warns against close friendship with a hot-tempered person, lest you learn their ways and entangle yourself in a snare (Proverbs 22:24-25), a caution that anger and volatility, left unchecked, are contagious in close relationships. It also warns against companions given to excess and indulgence, since such friendships tend to drag down rather than lift up (Proverbs 23:20-21).
These aren't commands to avoid people who struggle, everyone struggles somewhere, but warnings against choosing your closest, most formative relationships from among those whose patterns you don't want shaping your own life. Discernment here is wisdom, not judgment.
What to Look for in a Good Friend
A good friend, biblically defined, tells you the truth even when it's uncomfortable (Proverbs 27:6), shows up consistently in hard seasons (Proverbs 17:17), and points you toward God rather than away from Him. Look for people whose faith seems genuine, whose character you respect, and who make you want to love Christ more, not less, the longer you know them.
Also look for reciprocity. A one-sided friendship where you're always giving wisdom, encouragement, and effort while receiving little in return may need boundaries, even if the other person isn't a bad influence exactly, simply an exhausting one. Watch, too, for how a potential friend handles their own failures and correction; humility under criticism is often a better predictor of long-term character than how someone behaves when everything is going well.
Being Intentional Rather Than Passive
Many friendships form simply by proximity, whoever happens to sit nearby, work alongside you, or share a hobby, without much conscious thought about whether that person is a good influence. Scripture's warnings about companionship suggest believers should be more intentional than that, actively seeking out relationships with people who love God and pursue wisdom rather than passively accepting whoever is closest at hand (Proverbs 2:1-5).
This might mean joining a church small group specifically to build friendships with other believers, or seeking out an older, wiser Christian willing to mentor you. Good friendships, like most valuable things, often require deliberate pursuit rather than simply waiting for them to appear.
What About Relationships You Can't Simply Choose to Avoid?
Not every difficult relationship can simply be avoided. Family members, coworkers, classmates, and neighbors are part of life whether or not their character matches what Proverbs commends in a close friend. Paul himself clarified that he never meant believers should avoid all contact with immoral or difficult people in the world, since that would require leaving the world altogether; his warning about close companionship was aimed at willful, unrepentant sin within the church, not at ordinary contact with imperfect people everywhere (1 Corinthians 5:9-10). Scripture's warnings about companionship are not a command to withdraw from every imperfect person you cannot help but see regularly; that would make ordinary life, and evangelism, impossible.
The wisdom here concerns depth, not mere proximity. You can remain kind, present, and civil with someone whose patterns concern you, while being intentional about not making them your closest confidant or the person whose opinion shapes your major decisions. There is a real difference between being cordial with a difficult coworker and choosing that same person as your most trusted friend; the first is simply required by life together, the second is a choice Scripture calls you to make wisely.
Choosing Well Without Becoming Judgmental
Choosing good friends wisely does not license Christians to become snobbish or to write off people who don't yet know Christ. Jesus's example of befriending sinners to draw them toward truth remains the model for evangelistic friendship (Mark 2:15-17). The wisdom here concerns who shapes you most deeply, your inner circle, not who you're kind to or spend time with more broadly.
Pray for discernment about your closest relationships, and be willing to gently create distance from friendships that consistently pull you away from Christ, while still loving people, including former close friends, with grace and prayer for their good (Matthew 5:44).