"Nothing within this world is sufficient basis for a meaningful life here. If we base our lives on work and achievement, on love and pleasure, or on knowledge and learning, our existence becomes anxious and fragile— because circumstances in life are always threatening the very foundation of our lives, and death inevitably strips us of everything we hold dear. Ecclesiastes is an argument that existential dependence on a gracious Creator God— not only abstract belief— is a precondition for an unshakeable, purposeful life."
Keller, Timothy (2012-11-13). Every Good Endeavor: Connecting Your Work to God's Work (p. 100). Dutton Adult. Kindle Edition.