What does Psalm 139:18 mean?
God's thoughts and understanding are far beyond human comprehension (Isaiah 55:8–9). David compares God's thoughts to grains of sand: numerous and beyond a person's ability to count.David testifies that when he awakes, he is still with God. The meaning is he meditates on God's attributes during the night and during his waking hours. He responds to God's constant thoughts toward him by thinking deeply about God. He is aware that God is still with him in the morning, and this awareness prompts him to adore God.
God's presence in our lives is never interrupted. He is with us at all times, surrounding us with His love. The apostle Paul declared that nothing can separate from the love of God in Christ Jesus our Lord. He wrote: "For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord" (Romans 8:38–39).