(Image courtesy of http://www.pa-journal.com.)
"All things have been made by him and for him" (Colossians 1:16). 
"What does it profit a man if he gains the whole world, yet loses his soul?" (Matthew 16:26). 
"You shall love the Lord your God with all your heart, with all your soul, and with all your mind" (Matthew 22:37).
"Man's chief end is to glorify God and to enjoy him forever" (Question 1, Westminster Shorter Catechism). 
Some would say that the Bible has authority only over the sacred things, such as faith (religion) and the practice of that faith. In stark contrast, God is not only sovereign over the sacred things, but also over the secular things (i.e., business, education, family life).

Sadly, some believers today - including whole churches - have been so enamored by the "successful" business world that they have replaced God's Word with "effective habits." While these "habits" may be well-principled, they do not capture the proper perspective of success, nor do they speak to man's true purpose for existing. The Bible, on the other hand, rightly and completely informs my practice in all areas of life, not just in matters regarding faith and practice, strictly speaking. It speaks to my parenting (Prov 22:6); it speaks to my marriage (Eph 5) and also my function in marriage (Gen 1-3; 1 Pet 3:7); it speaks to how I should approach earthly gain (Mat 16:26); it speaks to how I should educate my children (Psa 78); it speaks to even how I should eat my food, drink my water, and tie my shoes (1 Cor 10:31). The Word of God is the only source of Truth in this world (note the capital T - there are many sources of truth, lower case t).