If your congregation sings only Hillsong choruses, then their emotional repertoire will be limited to about two different feelings (God-you-make-me-happy, and God-Iā€™m-infatuated-with-you) ā€“ considerably less even than the emotional range of a normal adult person. It is why entire congregations sometimes seem strangely adolescent, or even infantile: they lack a proper emotional range, as well as a suitable adult vocabulary. But in the psalter one finds the entire range of human emotion and experience ā€“ a range that is vastly wider than the emotional capacity of any single human life.