Iron sharpens iron; so a man sharpens the countenance of his friend. ( Proverbs 27:17 UKJV)

It signifies a relationship in which people elevate and refine one another—much like metals sharpening each other through friction—by holding one another accountable and offering candid, even uncomfortable, feedback to bring out the best in each other.

He that walks with wise men shall be wise: but a companion of fools shall be destroyed. ( Proverbs 13:20 UKJV)

Spending time with people who possess sound judgment, emotional maturity, integrity, and wholesome values ​​naturally has a positive influence on you. Conversely, associating with those who make reckless, arrogant, or destructive choices can drag you into unnecessary trouble or leave you affected by their poor decisions.

The righteous is more excellent than his neighbour: but the way of the wicked seduces them. (Proverbs 12:26 UKJV)

Just as good friends encourage positive growth and mutual integrity, negative influences can undermine your goals and values..

A friend loves at all times, and a brother is born for adversity. (Proverbs 17:17 UKJV)

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Faithful are the wounds of a friend; but the kisses of an enemy are deceitful. (Proverbs 27:6 UKJV)

It teaches that the sincere—albeit painful—counsel of a true friend who cares about you is far more valuable than the false flattery or praise of someone who seeks to harm you.