14. Stand therefore. Now follows a description of the arms which they were enjoined to wear. We must not, however, inquire very minutely into the meaning of each word; for an allusion to military customs is all that was intended. Nothing can be more idle than the extraordinary pains which some have taken to discover the reason why righteousness is made a breastplate, instead of a girdle. Paul’s design was to touch briefly on the most important points required in a Christian, and to adapt them to the comparison which he had already used.
Truth, which means sincerity of mind, is compared to a girdle. Now, a girdle was, in ancient times, one of the most important parts of military armor. Our attention is thus directed to the fountain of sincerity; for the purity of the gospel ought to remove from our minds all guile, and from our hearts all hypocrisy. Secondly, he recommends righteousness, and desires that it should be a breastplate for protecting the breast. Some imagine that this refers to a freely bestowed righteousness, or the imputation of righteousness, by which pardon of sin is obtained. But such matters ought not, I think, to have been mentioned on the present occasion; for the subject now under discussion is a blameless life. He enjoins us to be adorned, first, with integrity, and next with a devout and holy life.