The phrase "those who wait upon the Lord" often refers to people who patiently trust in God's timing and guidance. It is frequently connected to the Bible verse Isaiah 40:31, which says: "But those who wait upon the LORD shall renew their strength; they shall mount up with wings like eagles; they shall run, and not be weary; and they shall walk, and not faint." This passage encourages believers to have faith and patience, promising that God will provide strength and endurance to those who trust Him. If you'd like, I can provide more context or reflections on this phrase!