God created me--and you--to live with a single, all-embracing, all-transforming passion--namely, a passion to glorify God by enjoying and displaying His supreme excellence in all the spheres of life...the mark of God-enthralled joy is to overflow and expand by extending itself into the hearts of others. The wasted life is the life without a passion for the supremacy of God in all things for the joy of all peoples...We waste our lives when we do not pray and think and dream and plan and work toward magnifying God in all spheres of life.
John Piper
Don't Waste Your Life pp 31-32