The New Testament directly quotes the Old 283 times. Of these, 116 or 41% are from the Psalms. The Psalms speak to every aspect of human experience, and give us a vocabulary to pray to God. Calvin connected the understanding of the Psalms to one’s depth of doctrine:

In short, as calling upon God is one of the principal means of securing safety, and as a better and more unerring rule for guiding us in this exercise cannot be found elsewhere than in the Psalms, it follows, that in proportion to the proficiency which a man shall have attained in understanding them, will be his knowledge of the most important part of celestial doctrine.

Nearly half of allusions to Jesus in the NT are also from the Psalms. One could hardly do better than to pray the Psalms every day.