I stooped down to strain water from the stream. I filled my filter with the creek’s crystal clear hydration, and went to work. I know better than to drink unfiltered water when backpacking, no matter how clean it appears to be. Unseen bacteria and microscopic debris can cause infections and ailments when ingested, and a strong filter is required for making water in the outdoors drinkable. But, as I collected the water, I glanced to the right and noticed an unforeseen bacterial threat: my dog squatting in the stream and releasing a stream of her own.
I was sure that the sanitizing filter would sterilize the water, but I couldn’t bring myself to do it. I could have even waited until the yellow toxin passed by, but the water source was no longer “number one” in my opinion. Foreign chemicals were introduced to it, and it was a “wee” too contaminated. Therefore, I strolled up the stream to a sparkling spring, and hydrated myself there instead. And, every backpacking trip since then, my dog must wait on the bank so I may filter water with a peace of mind.
I was reminded in that moment of the wise words written by Solomon: “Keep your heart with all vigilance, for from it flow the springs of life” (Prov. 4:23). According to Solomon, the heart is like a gushing spring. The fountain of the heart naturally flows into our lives and the lives of others, just as a spring naturally flows into the forest to nourish vegetation and animals. And thus, the spring of the heart must be clean, for if it is polluted, contamination will gush into our life and the lives of everyone around us. Therefore, the believer must guard the heart “with all vigilance,” and pay close attention to what goes into the heart, since whatever goes in will inevitably come out.
As Charles H. Spurgeon once remarked, “We must keep our hearts pure; for if the heart be not pure, the life can not be pure. Whence come our carnality, covetousness, pride, sloth, and unbelief? Are they not all to be traced to the corruption of our hearts?” This is what Jesus taught, too. He cautioned, “The good person out of the good treasure of his heart produces good, and the evil person out of his evil treasure produces evil, for out of the abundance of the heart his mouth speaks” (Luke 6:45; cf. Matt. 15:18-19).
That is why David prayed, “Create in me a clean heart, O God; and renew a right spirit within me” (Psalm 51:10, KJV). We must pray for this also, and we must keep a close eye on what enters our hearts. When sin does—whether from the flesh, the world, or the devil—our hearts are polluted. But, when Scripture does, our hearts are purified (John 17:17; Eph. 5:26).
Bible Gleanings is a widely-read weekend devotional column, written for the Murray Ledger & Times in Calloway County, Kentucky.

Brandon is the founder and main contributor to Brandon’s Desk, the blog with biblical resources from his ministry. He pastored the family of believers at Locust Grove Baptist Church in Murray, Kentucky for six years. He and his wife Dakota live there with their three dogs, Susie (Jack Russell), Aries (English Shepherd), and Dot (Bluetick Beagle).
For more devotional entries like this, check out Brandon’s latest book, Bible Gleanings Volume II, which features 100 daily devotionals gleaned from God’s word:
Brandon is the founder and main contributor to Brandon’s Desk, the blog with biblical resources from his ministry. He is proud to be the pastor of the family of believers at Locust Grove Baptist Church in Murray, Kentucky. He and his wife Dakota live there with their three dogs, Susie, Aries, and Dot.