Proverbs 4:20-27

The chapter closes with a full security briefing on the human person — ears (v. 20), eyes (v. 21), heart (v. 23), mouth (v. 24), eyes again (v. 25), feet (v. 26). And at the center of the formation stands the most important verse on the inner life in the whole Old Testament:

"Keep thy heart with all diligence; for out of it are the issues of life."

The heart, in the Bible, is not just your feelings — it is mission control: mind, affections, conscience, and will in one room. And "with all diligence" means above every other guarding — beyond everything else you protect. Think about what you already guard: your phone has a passcode, your house has locks, your money has a bank, your truck has an alarm. Man is a skillful keeper of everything he owns — gardens, accounts, even the sea walled off from reclaimed farmland — everything except the one thing heaven says to guard first. "Thou mayest make another thy park-keeper, thy housekeeper, thy shopkeeper, thy cash-keeper" — said an old Puritan — "but thou must be thy own heart-keeper."

Why the heart above all? "For out of it are the issues of life" — the outflows. The heart is the wellspring, and every stream in your life runs downhill from it: words, habits, decisions, character, destiny. Poison the well and you poison every faucet in the house; no use scrubbing the taps. This is exactly the Lord Jesus' diagnosis: "out of the heart proceed evil thoughts, murders, adulteries..." (Matthew 15:19), and "out of the abundance of the heart the mouth speaketh" (Matthew 12:34). It is also why behavior-modification religion always fails — it polishes faucets.

How does a man actually keep his heart? Two hands working together. God's hand first: the natural heart is "deceitful above all things" (Jeremiah 17:9) and no man can renovate his own — the new heart is God's gift through faith in Christ. But God's working never cancels yours: "work out your own salvation... for it is God which worketh in you" (Philippians 2:12–13). So the believer garrisons what grace gave him: he posts a sentinel (watchfulness — and prayer at the first movement of an evil thought, while it's still far-off motion in the grass); he victuals the fort ("starved soldiers cannot defend a fort" — a heart fed no Scripture will surrender to anything); and he keeps the Word "in the midst" of the heart (v. 21), which is the salt thrown into the spring itself.

Then the three outflow gates, in order:

The mouth (v. 24). "Put away from thee a froward mouth" — and the command to put it away admits it's already in there; no man was born with a clean one. The filter that works is one sentence: Thou God hearest me. If a respected guest entered the room, half the talk in any crew would die instantly — yet the King of heaven hears every word and the talk rolls on. Pour your speech through that strainer and it comes out fewer and cleaner. And mind the stakes: a rotten word, once out, is a fire kindled outside yourself — it goes on burning in other people after you've forgotten you struck the match.

The eyes (v. 25). "Let thine eyes look right on" — locked ahead, like a plowman who can't cut a straight furrow looking sideways. The sideways glance is where most wrecks begin: Eve looked at the tree instead of the command; Achan saw, coveted, took; David's one rooftop look cost him a kingdom's peace. It works in business too — the man who keeps glancing at his neighbor's speculation jumps for the same prize and draws a blank. In an age where the sideways glance is an industry with an algorithm, this verse is armor: aim the eyes. The pleasures of sin do not lie in the road; they belong to the by-paths.

The feet (vv. 26–27). "Ponder the path of thy feet" — weigh it, clear it, level it: walk the route in your mind first, clear the obstacles, weigh it before you're on it. The best time to ponder any path is at the beginning — not the middle, certainly not the end; men who leap first and think afterward end up either believing a lie or refusing the truth they discover too late. And weigh with honest scales: "everyone's doing it" and "that's just how it works now" are crooked balances — quack instruments. The Word of God is the standard weight, stamped with heaven's seal — your paths will be weighed by it at the end, so weigh them by it at the start. This counts double for the biggest steps: career, money — and marriage above all; the man who takes that leap in the dark can expect to land in a dark pit, but when children of God refer the matter to their Father, those marriages really are made in heaven. Then verse 27 closes the briefing in six words of pure compression: stay off the side roads; remove thy foot from evil.