Though work is good, wealth can can drive a person into places he or she doesn't want to go (Eccl. 4:4-16; Luke 14:27-29).
Solomon begins to chronicle his search for meaning, and cannot find it in self indulgence, wisdom, or hard work (Eccl. 2:1-26; Phil. 3:18-21).
The temporal nature of things "under the sun," and newness only being found in Christ (Eccl. 1:1-18, Eph. 2:5-6).