There is a common tendency when planning a worship service to handpick hymns and songs that only you like. Or your grandmother liked. And while there is certainly not necessarily anything overtly wrong with that practice, it does not necessarily fulfill the primary purpose of the worship service, which is, namely, a corporate recognition of the grace that is shared by all in attendance. The “psalms, hymns, and spiritual songs” which comprise the worship service ought to have as their foremost purpose the public acknowledgment and acclamation and adoration of Christ the Lamb, the One who takes away the sins of the world and who has promised to make all things new.