"For all have sinned, and are under the curse. However he does not say this yet, lest he should seem to lay it down of himself, but here again establishes his point by a text which concisely states both points; that no man has fulfilled the Law, (wherefore they are under the curse,) and, that Faith justifies. What then is the text? It is in the book of the prophet Habakkuk, "The just shall live by faith," (Hab. ii: 4) which not only establishes the righteousness that is of Faith, but also that there is no salvation through the Law. As no one, he says, kept the Law, but all were under the curse, on account of transgression, an easy way was provided, that from Faith, which is in itself a strong proof that no man can be justified by the Law. For the prophet says not, "The just shall live by the Law," but, "by faith".
John Chrysostom, Homily on Galatians 3