Proverbs 4:23

²¹ Do not lose sight of them; keep them within your heart.

²² For they are life to those who find them, and health to the whole body.

Guard your heart with all diligence, for from it flow springs of life.

²⁴ Put away deception from your mouth; keep your lips from perverse speech.

²⁵ Let your eyes look forward; fix your gaze straight ahead.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: Guard your heart with all diligence, for from it flow springs of life.
KJV: Keep thy heart with all diligence; for out of it are the issues of life.
WEB: Keep your heart with all diligence, for out of it is the wellspring of life.
ASV: Keep thy heart with all diligence; For out of it are the issues of life.
DARBY: Keep thy heart more than anything that is guarded; for out of it are the issues of life.
BLB: With all diligence, guard your heart, for from it [are] the outgoings of life.

ÅB: Bevar ditt hjerte fremfor alt det som bevares; for livet utgår fra det.
OTB: Vokt ditt hjerte med all årvåkenhet, for det er livets kilde.
B1930: Bevar ditt hjerte fremfor alt det som bevares; for livet utgår fra det.

Luke 6:45
The good man brings good things out of the good treasure of his heart, and the evil man brings evil things out of the evil treasure of his heart. For out of the overflow of the heart, the mouth speaks.
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Matthew 12:34–35
You brood of vipers, how can you who are evil say anything good? For out of the overflow of the heart, the mouth speaks.
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Mark 7:21–23
For from within the hearts of men come evil thoughts, sexual immorality, theft, murder, adultery,
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Psalms 139:23–24
Search me, O God, and know my heart; test me and know my concerns.
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Proverbs 13:3
He who guards his mouth protects his life, but the one who opens his lips invites his own ruin.
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Jeremiah 17:9
The heart is deceitful above all things and beyond cure. Who can understand it?
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Matthew 15:19
For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false testimony, and slander.
Read in context
Proverbs 23:19
Listen, my son, and be wise, and guide your heart on the right course.
Read in context