Truth is a crucial piece in the believer’s armour, girding the loins and, as such, freeing a man from life's entanglements.
The God of the Bible is a God of truth. On the other hand, the Devil is the great enemy of truth. The Bible says of him, “there is no truth in him.”
When a believer meditates upon the things of God, those truths become more firmly planted in the heart. Eventually, the contents of the heart become evident from the words that escape the mouth (Luke 6:45). Therefore, the meditations of our heart will eventually be the words of our conversations. This is exactly the truth conveyed by Asaph in our passage from Psalm 77. He understood that meditation upon the work of God would eventually cause him to talk of God’s doings. It is right for God’s people to speak truth, especially when it concerns testifying to the truth of God’s holy words. Yet, this is not possible unless a believer first hides the words of God in his heart (Psalm 119:11), and one way to do so is through meditation.