The feast of St Thomas was reduced to a commemoration in Lent under the 1962 rubrics, which meant it was very rarely celebrated.
However, the decree Cum Sanctissima now allows it to be celebrated as a Class III feast, so herewith the reading for it:
St Thomas Aquinas (March 7)
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   Lectio 3: Thomas Aquínas, nobílibus paréntibus natus, iam aduléscens, invítis matre
  et frátribus, órdinem Prædicatórum suscépit et Lutétiam Parisiórum missus
  est. Verum fratres, in itínere eum aggréssi, in arcem castri sancti Ioánnis
  perdúcunt, ubi angélicus iúvenis mulíerem, quæ ad labefactándam eíus
  castitátem introdúcta fúerat, titióne fugávit. Parísiis philosophíæ ac
  theologíæ ita óperam dedit, ut vix vigínti quinque annos natus, públice philósophos
  ac theólogos summa cum laude interpretátus sit. Numquam se lectíoni aut
  scriptióni dedit, nisi post oratiónem. Cum aliquándo hanc Iesu crucifixi
  vocem audísset: Bene scripsísti de me, Thoma; quam ergo mercédem accípies?
  amantíssime respóndit: Non áliam, Dómine, nisi teípsum. Nullum fuit
  scriptórum genus, in quo non esset diligentíssime versátus. Ab Urbáno quarto
  Romam vocátus, eius iussu lucubrávit Officium pro solemnitáte Córporis
  Christi. Missus a beáto Gregório décimo ad concílium Lugdunénse, in
  monastério Fossæ Novæ in morbum íncidit, et ibi ægrótus Cántica canticórum
  explanávit. Ibídem óbiit quinquagenárius, anno millésimo ducentésimo
  septuagésimo quarto, Nonis Mártii. Ipsum Leo décimus tértius cæléstem
  patrónum scholárum ómnium catholicárum declarávit et instítuit. V. Tu autem, Dómine,
  miserére nobis. R. Deo grátias.  | 
  
   Reading 3: Thomas Aquinas, born of noble parents,
  entered the Order of Preachers while he was still quite young, against the
  will of his mother and brothers, He was sent to Paris; but his brothers
  waylaid him on the journey and abducted him to the castle of San Giovanni.
  There the angelic youth put to flight with a firebrand a woman who had been
  brought in to cause him to lose his chastity. At Paris, he devoted himself to
  the study of philosophy and theology with such success that, when he was
  scarcely twenty-five years old, he gained the highest praise for his public
  commentaries on the works of the philosophers and the theologians. He never
  started to read or write without first having prayed. Once he heard: these
  words from Jesus crucified: “You have written well about Me, Thomas. What
  reward would you like to receive?" And he lovingly answered, "None
  but Yourself, Lord." There was no kind of writing in which he was not
  thoroughly versed. Summoned to Rome by Urban IV, at his command he composed
  the Office for the feast of Corpus Christi. On his way to the Council of
  Lyons, to which he had been sent by St. Gregory X, he was taken ill at the
  monastery of Fossa Nuova and, as he lay sick, he interpreted the Canticle of
  Canticles. He died there at the age of fifty years, on March 7, 1274. Leo
  XIII proclaimed and appointed him the heavenly patron of all Catholic
  schools. V. But thou, O Lord, have mercy upon us. R. Thanks be to God.  |