Romans 3:4

God only is essentially true. All men in their own capacity are liable to lies and errors: nevertheless God, who is the truth, will make good his promise of keeping his Church in all truth. See St. John, xvi. 13. (Challoner) --- The Greek text has, "may God be true;" that is, may all men acknowledge him as such; let the whole world know, that he neither can be unfaithful to his word, nor his promises; and that, on the contrary, all men of themselves have but lies and vanity for their portion. --- That thou mayest be justified, &c. The particle that, is not casual in this place, but only marks the event. Thy conduct shews that thou art faithful and true to thy promises, and that, notwithstanding the judgments of men, thou art always unchangeable and infallible. Thou art victorious, when judged by them; thou shewest them the falsity and injustice of their judgments. (Calmet) --- And that the infidelity of man, so far from affecting the fidelity of God, will only serve to set it off in a more striking and clearer light. (Bible de Vence)