Whether a man can lawfully hope in man?

Objections

Objection 1 : It wold seem that one may lawfully hope in man. For the object of hope is eternal happiness. Now we are helped to obtain eternal happiness by the patronage of the saints, for Gregory says (Dial. i, 8) that "predestination is furthered by the saints' prayers." Therefore one may hope in man.
Objection 2 : Further, if a man may not hope in another man, it ought not to be reckoned a sin in a man, that one should not be able to hope in him. Yet this is reckoned a vice in some, as appears from Jer. 9:4: "Let every man take heed of his neighbor, and let him not trust in any brother of his." Therefore it is lawful to trust in a man.
Objection 3 : Further, prayer is the expression of hope, as stated above (Article [2], Objection [2]). But it is lawful to pray to a man for something. Therefore it is lawful to trust in him.