Whether we ought to pray to God alone?

Objections

Objection 1 : It would seem that we ought to pray to God alone. Prayer is an act of religion, as stated above (Article [3]). But God alone is to be worshiped by religion. Therefore we should pray to God alone.
Objection 2 : Further, it is useless to pray to one who is ignorant of the prayer. But it belongs to God alone to know one's prayer, both because frequently prayer is uttered by an interior act which God alone knows, rather than by words, according to the saying of the Apostle (1 Cor. 14:15), "I will pray with the spirit, I will pray also with the understanding": and again because, as Augustine says (De Cura pro mortuis xiii) the "dead, even the saints, know not what the living, even their own children, are doing." Therefore we ought to pray to God alone.
Objection 3 : Further, if we pray to any of the saints, this is only because they are united to God. Now some yet living in this world, or even some who are in Purgatory, are closely united to God by grace, and yet we do not pray to them. Therefore neither should we pray to the saints who are in Paradise.