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St. Thomas Aquinas writes in his introduction to his Commentary on Psalms 1-54*:
The material [of the Psalms] is universal, for while the particular books of the Canon of Scripture contain special materials, this book has the general material of theology as a whole.
…
the work of God is fourfold; namely, that of creation, …; governance, …; reparation, …; glorification, ….There is a complete treatment of all these things in this doctrine [i.e., in the psalms].
cf. ch. 13 § "The Course on the Psalms" of Jean-Pierre Torrell, O.P.'s Saint Thomas Aquinas: The Person and His Work.
Those who pray the traditional Divine Office (e.g., priests and religious) pray all 150 psalms in a week.
*(cf. also St. Robert Bellarmine's commentaries on all the psalms)