Herman Selderhuis, in Calvin’s Theology of the Psalms, notes how Calvin grew in his love and appreciation for the Psalter:
…for Calvin the book of the Psalms assumed greater and greater significance in his theological development. In the first edition of the Institutes (1536) the Psalter is the least-quoted biblical book, in the last edition it is quoted more than any other with the one exception of the epistle to the Romans. (16)
Is it fair to conclude that a sign of growing Christian maturity is a deeper appreciation for God’s songbook?