Text: Proverbs 3:5-6
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Trust in the LORD with all your heart, and do not lean on your own understanding. In all your ways acknowledge him, and he will make straight your paths (Prov. 3:5-6).
Trusting in My Stud Finder
This month I have been doing some renovations in my basement (see picture below). One of the most important tools that I used in this project was my stud finder. When you use a stud finder you have to trust that it knows what’s behind a wall (because you can’t see with your eyes what’s behind the wall). To “trust” in something is to “put your confidence” in that thing.
Trusting in the LORD
Trusting isn’t easy. Proverbs 3:5 says, “Trust in the LORD with all your heart” (v. 5a). The Hebrew word for “trust” (bātah) is often used for a foolish kind of trust. For example, Psalm 52:7 says, “See the man who would not make God his refuge, but trusted in the abundance of his riches and sought refuge in his own destruction!” The object of one’s trust determines if that trust is wise or foolish. It’s foolish to trust in a false god like “the abundance of riches.” But it’s wise to trust in “in the LORD.”
Trusting in the LORD is the wise way to live.
We are to trust in the LORD “with all [our] heart.” In the English language, we distinguish between the “heart” (emotions) and the “mind” (intellect). But in the OT, the “heart” (leb) is “the center of a person’s emotional-intellectual-religious-moral activity.”  In the OT, the heart thinks.  For example, Proverbs 16:9 says, “The heart of man plans his way, but the LORD establishes his steps.”
So Proverbs 3:5 is not talking about an irrational trust (i.e., a separation of the intellect from trust). It’s not saying that we are to just trust and not think. Proverbs 15:14 says, “The heart of him who has understanding seeks knowledge.”
Many people would say that it’s foolish that Christians put their trust in a God who can’t be seen (and, in their opinion, whose existence lacks evidence). It’s true that we can’t see God, but it’s not true that he hasn’t revealed himself. God has revealed himself through creation, through Scripture, through Jesus, and through the Holy Spirit.
Strengthening Our Trust
Trusting in the LORD “with all your heart” is complete trust. If we’re honest we’ll admit that we often lack this kind of trust in God. We’re like the man who said to Jesus, “I believe; help my unbelief!” (Mark 9:24).
How can our trust in God be strengthened? Proverbs 3:5-6 give us three truths about the LORD that can strengthen our trust in him.
1. The LORD is a promise-keeping God.
Our trust is to be “in the LORD.” Who is “the LORD”? He is Yahweh.  Yahweh is God’s personal name. There is a connection between the name Yahweh and the covenants with his people. In Exodus 6:2-5, God said to Moses,
I am the LORD. I appeared to Abraham, to Isaac, and to Jacob, as God Almighty, but by my name the LORD I did not make myself known to them. I also established my covenant with them to give them the land of Canaan, the land in which they lived as sojourners. Moreover, I have heard the groaning of the people of Israel whom the Egyptians hold as slaves, and I have remembered my covenant.Yahweh “remembered [his] covenant” with Abraham, Isaac, and Jacob, and he kept his covenant. He told Moses to tell the people of Israel,
I am the LORD, and I will bring you out from under the burdens of the Egyptians, and I will deliver you from slavery to them, and I will redeem you with an outstretched arm and with great acts of judgment. I will take you to be my people, and I will be your God, and you will know that I am the LORD your God, who has brought you out from under the burdens of the Egyptians. I will bring you into the land I swore to give to Abraham, to Isaac, and to Jacob. I will give it to you for a possession. I am the LORD (Exod. 6:6-8).We now live in the days of the new covenant. During the Last Supper, Jesus said to his disciples, “This [cup] is my blood of the covenant, which is poured out for many for the forgiveness of sins” (Matt. 26:28). This covenant was promised in the days of Jeremiah the prophet:
Behold, the days are coming, declares the LORD, when I will make a new covenant with the house of Israel and the house of Judah, not like the covenant that I made with their fathers on the day when I took them by the hand to bring them out of the land of Egypt, my covenant that they broke, though I was their husband, declares the LORD. But this is the covenant that I will make with the house of Israel after those days, declares the LORD: I will put my law within them, and I will write it on their hearts. And I will be their God, and they shall be my people. And no longer shall each one teach his neighbor and each his brother, saying, “Know the LORD,” for they shall all know me, from the least of them to the greatest, declares the LORD. For I will forgive their iniquity, and I will remember their sin no more (Jer. 31:31-34).Yahweh kept this covenant when Jesus entered into our world to die for our sins. When we put our trust in him, we are delivered from slavery to sin and enter into a relationship with Yahweh (i.e., we “Know the LORD,” Jer. 31:34). Yahweh will keep all of the promises that he has given to those whose faith is in Christ.
2. The LORD is an all-wise God.
We are told to “lean not on [our] own understanding” (v. 5b). Our “understanding” is often faulty (like a broken deck railing—don’t lean on it!). Sometimes we doubt the wisdom of God.
There’s a category of Psalms called the psalms of lament. Psalm 142 is a psalm of lament. David wrote Psalm 142 when he was hiding from King Saul in a cave. In the psalm, David complains, “No refuge remains to me; no one cares for my soul” (v. 4). But he ends the psalm by expressing trust in God: “I cry to you, O Lord; I say, ‘You are my refuge, my portion in the land of the living’” (v. 5). When life frustrates us, God wants us to bring our complaints to him, but he never wants us to stop trusting him.
3. The LORD is a guiding God.
Verse 6 says, “In all your ways acknowledge him, and he will make straight your paths.” [During my sermon I drew a zigzaggy line on a piece of paper. The line doesn’t look straight. But if you drew similar lines on several pieces of paper and connected those pieses of paper together and looked at the line from a bird’s-eye view, it would look straight.] Waltke writes, “One has to view the course of one’s life from a bird’s-eye view, not from a worm’s eye view, to see this truth.”  A Portuguese proverb says, “God writes straight with crooked lines.”
 Bruce K. Waltke, The Book of Proverbs: Chapters 1-15, 91-92.
 The function of the brain was unknown in the Old Testament.
 The Jews eventually stopped saying “Yahweh” out of reverence for the name and replaced it with the Adonai, meaning “Lord.” Most English translations of the OT have followed this tradition.
 Waltke, The Book of Proverbs: Chapters 1-15, 245.