Saint Chrysostom says: “Youthful desires are not only fornications, but every inappropriate impulse betrays youth. Let those who have grown old note this for themselves, that they should not do what the youngest do. If someone is harsh in words, or shows stubbornness and domineering in deeds, or permits himself something similar, all these are youthful and unreasonable impulses.
“All this is characteristic when the heart has not yet been moderated and settled, and when the thoughts of the mind are not deepened, but easily skim over the surface. Therefore, lest anyone be carried away by this, what does the Apostle teach? Flee youthful fantasies.”
Having removed what could drive one toward an imprudent manner of acting, the Apostle points out the moral supports of prudence. “But pursue,” διωκε, that is, chase after, strive zealously, and labor in every way to manifest, “righteousness, faith, love, and peace.”
Righteousness and love are two dispositions that embrace all morally good deeds and reject all bad ones. Righteousness does not allow one to do anything improper and keeps one within the bounds of what is due. Love, within these bounds, urges one to multiply every good.
Faith is the mother, nourisher, and guardian of these dispositions. Peace is their offspring, the common result of their deeds, like a cloud overshadowing them. Whoever is inspired by faith, directs all zeal toward works of righteousness and love, and thereby walks under the cloud of peace, cannot fail to have comprehensive prudence reign in his works.
The Apostle teaches one to have peace “with all who call upon the Lord from a pure heart.” He placed two limitations: “with those who call upon the Lord,” and “who call from a pure heart.” He does not mean that one should not carefully preserve peace with others. Rather, he warns that one should not become intimate with them, and not reach the point of living with them soul to soul.
General concord and peaceableness must be maintained with all. Yet one must, and can, live soul to soul only with believers, who are meant by those who call upon the Lord. In this respect, nothing prevents joining the words “from a pure heart” with peace. The meaning would be: keep sincere peace with those who call upon the Lord.
Peace with such people is formed by itself and fills the hearts of believers, especially pastors, who know all their flock more than others. Unity of convictions and aspirations fuses souls, and they live in one another.
Such harmony of souls, however, is hindered and disrupted where insincerity of faith is noticed in someone. As soon as it becomes clear that one or another calls upon the Lord insincerely, or believes in Him not from the heart, harmony with them is immediately disturbed. There naturally arises the suspicion that they are surely pursuing other aims, not those inspired by faith. They are aiming elsewhere. There is nothing to harmonize with them about.
In this respect, “from a pure heart” must be joined with “those who call upon the Lord.” Saint Chrysostom interprets it this way: “What does ‘with those who call upon the Lord from a pure heart’ mean? It is as if he says: do not trust all who call upon the Lord, but only those who call upon Him without pretense, without hypocrisy, and without deceit. Associate with such people. With others one should not be intimate, but only preserve peace as far as possible.”