Psalm Citations in the Epistle to the Hebrews

Something which draws the immediate attention of the reader is the abundance of psalm citations in the Epistle to the Hebrews. In the first chapter five out of the seven quotations are taken from the Psalter. Also in the other chapters passages out of the book of Psalms represent an important share in the number of OT citations quoted. Undoubtedly the question will be raised what the author's purp...