Prayer is a chief part of divine worship, so angels and saints are not to be invoked
That neither angels nor the blessed spirits of the just are to be prayed to or invoked is settled by this: Scripture counts prayer and invocation a principal part of divine worship and a chief and special duty of our religion toward God.
That is why Scripture calls God's temple "the house of prayer" (Isaiah 56:7; Matthew 21:13), and sets the prayers and supplications of the faithful before us as a kind of spiritual sacrifice (Psalm 141:2; Hebrews 13:15). And we are taught to call only on him in whom our faith rests, as the Apostle says: "How shall they call on him in whom they have not believed?" (Romans 10:14).
Latin
LXXXIX. Caeterum nec Angelos, nec Beatos justorum Spiritus precandos & invocandos esse ex eo constat, quod Scriptura sacra Orationem & invocationem pro insigni cultus divini parte habet, & eximio atque praecipuo nostrae Religionis erga Deum officio. Unde est quod templum Dei in Scriptura dicitur Domus Orationis; & fidelium preces atque orationes ut spirituale quoddam sacrificium proponuntur; & eum solum docemur invocare in quem fides nostra recumbit. Juxta illud Apostoli Quomodo invocabunt in quem non crediderunt? Es. 56. 7. Matth. 21. 13. Psal. 141. 2. Heb. 13. 15. Rom. 10. 14.