A firm beginning has already been laid for this. You have already become partakers of these blessings through your faith and through life according to faith, which is expressed in love for all the saints. For this I thank the Lord.
"For this reason." For what reason? If one considers only what immediately precedes, it is because they have been sealed with the Holy Spirit and have received in Him the pledge of hope. But since this last point stands in the Apostle in unbroken connection with what came before, as the summit of all blessings in the Lord, one may say that it is also because of everything the all-bountiful God was pleased to do for our salvation.
Saint Chrysostom says: "For this reason, that is, because of the future blessings which await those who believe rightly and live piously. Yet one must equally thank God for everything He has done for the human race before this and for what He will do afterward. Therefore one must thank Him also for the faith of believers."
Saint Paul gives thanks not generally for these blessings, but because the Ephesians were deemed worthy of them. Since they were deemed worthy of this through faith assisted by love, he sets their fullness in these things as the cause that awakens his thankful feelings for them.
"Having heard," he says, "of your faith and love, I do not cease to thank God." "For, having believed, you were sealed with the Spirit. In Him you received the pledge of future blessings and of perfect deliverance, and you are to obtain what has been laid up for those who believe rightly and live rightly" (Theophylact).
"Having heard of your faith and love." "Everywhere Saint Paul joins and unites faith and love, as a kind of wondrous pair" (Saint Chrysostom). If he had heard only of faith, perhaps he would not have hastened to give thanks. For although faith brings one to God, when it is united with Him in the heart, it no longer proceeds from Him alone, but mingled with love.
True faith is never alone, just as neither is love. Faith is one foot, love the other. As one cannot walk on one foot, so one cannot live in a Christian way and be deemed worthy of Christian blessings without faith and love.
Love for all the saints means love for all Christians, not only for the Ephesians or those around them. The love poured into the hearts of Christians by the Spirit loves all men. Yet it loves Christians as members of one body, in a family way, feeling a living union with them in Christ.
However natural this love may be in Christians, it can still be weakened and quenched by egotistical strivings. Therefore its presence together with faith is a sign both of the reasonable ordering of believers and of a special grace of God, for everything comes from it.
For this reason Saint Paul also says: "in Christ Jesus," which must be referred both to faith and to love. The Lord Jesus Christ is the inexhaustible source of both faith and love for all who have cleaved to Him. Faith here is the feeling of a heart that rests in Christ and is assured of every help and every protection from Him. It is faith resting on the bosom of Christ.
He had heard of faith and love, but he gives thanks not for faith and love, but for what is given for faith and love: "because, on account of them, they are evidently among those being saved, and will undoubtedly be deemed worthy of the blessings appointed for those who believe and love" (Oecumenius).