Are you aware that St Thomas Aquinas is the only theologian mentioned by name (on two occasions) in regard to the study of Sacred Doctrine or Theology in the documents of Vatican II? As Pope Paul VI said in his apostolic letter LUMEN ECCLESIAE (1974), “This was the first time an Ecumenical Council had recommended an individual theologian, and St Thomas was the one deemed worthy of the honour.” The name of St Thomas is mentioned in the Decree on the Training of Priests, Optatam totius, n.16: In order to cast light as completely as possible upon the mysteries of salvation, the students should learn to go into them more deeply and to perceive the connection between them through the use of speculation with St Thomas as their master.
There is a footnote (#36) attached to the above sentence which points us to an address given by Pope Pius XII, and an address and allocution given by Pope Paul VI. The Address (1964) given from Paul VI says: Those whose function it is to teach… should listen reverently to the Doctors of the Church, St Thomas chief among them. So great is the genius of the Angelic Doctor, so unalloyed his love of truth, and so profound his wisdom in penetrating, shedding light on and unifying among themselves even the loftiest truths, that his teaching is a most effective means not only of safeguarding the foundations of the faith but also of promoting its development along secure, healthy and profitable lines.
St Thomas is also mentioned by name in the Decree on Christian Education from Vatican II, Gravissimum Educationis, n.10: …this method follows the tradition of the Doctors of the Church and especially St Thomas Aquinas.
Confer also Pope Paul VI apostolic letter LUMEN ECCLESIAE (1974). English translation found here:
St John Paul II ADDRESS TO THE EIGHTH INTERNATIONAL THOMISTIC CONGRESS––13th September 1980:
Pope Benedict XVI said, “In his encyclical Fides et Ratio, my venerated predecessor, Pope John Paul II recalled that ‘the Church has been justified in consistently proposing St. Thomas a master of thought and a model of the right way to do theology’ (No. 43).
“It is not surprising that, after St. Augustine, among the writers mentioned in the Catechism of the Catholic Church, St. Thomas is quoted more than any other — some 61 times!"
Pope Francis claims that his apostolic exhortation Amoris Laetitia is thomistic apparently in an attempt to ease the concerns some have for some of the statements found in it.