What is the most striking difference between the spirituality of the wisdom books and that of the rest of the Old Testament?

The 'wisdom books' of The Bible and apocrypha are distinctive in that they are primarily concerned with man and his world, and particularly with the potential and limitations of the individual person. In the context of these books and psalms, wisdom is the ability to discern the best way to achieve the good things in life: success, prosperity, happiness and longevity. Of course, they also assume that wisdom is a gift from God.