When the promised blessings are received in the heart with certainty that they will be obtained, faith becomes unshakable.
Faith proclaims the blessings and assures us of their certainty. But hope is born in a particular way, and when it is born, it gives rest to faith itself.
Then faith stands as upon a rock. Therefore “because of the hope” must be referred both to love and to faith.
But one must also remember that faith, love, and hope are inseparably connected and continually influence one another.
Still, “because of the hope” seems more fittingly referred to “we give thanks.” We thank God for your faith and love, because great blessings have undoubtedly been laid up for you in heaven.
Counting your good as our own, we rejoice for you on this account and thank God. Saint Chrysostom understands it this way: “We rejoice,” says the Apostle, “that you have acquired something great for yourselves in heaven.”
Theophylact repeats the same: “Or it should be understood thus: we give thanks because you will certainly inherit incorruptible blessings.”
The words “laid up in heaven” indicate both the certainty of receiving and the security of what has been laid up.
The things laid up are pledges, brabeia, prizes in contests. Only reach the goal and prevail, and what is due to you is already prepared.
There it lies apart, laid up for the one who reaches the goal. If you reach it, it is yours.
When he says “in heaven,” he “indicates something secure,” as Saint Chrysostom says.
“It is not laid up on earth, where it would be subject to corruption, but in heaven, where it is whole and secure. Therefore do not waver in hope, for what is laid up for you is in a reliable place,” says blessed Theophylact.
“Of which you heard before,” that is, of which you had advance hearing and were forewarned. Where and when?
“In the word of the truth of the Gospel.” At the very time when you heard the word of the truth of the Gospel, you also heard of the blessings laid up for believers.
The Gospel is Gospel precisely because it proclaims great blessings to those who receive it. The promise of blessings goes ahead, stirs faith, and attracts the heart.
For what does the Gospel say? You are perishing. There is only one salvation for you, in the Lord Who is preached to you.
Believe, and you will be saved and receive eternal life. Those being instructed by the Gospel hear this first.
The Colossians also heard this. The Apostle reminds them of it, making them pass in thought through how they inclined toward faith, began to hope for what was laid up, and rested in it.
For the purpose of the Epistle it was very important that they restore all this more clearly in memory. Then there would be nothing mediating between their heart and the Lord.
Likewise, between them and God the Father, there would be no other mediator besides Christ the Savior.
The expression “in the word of the truth of the Gospel” means: in the most true word of the Gospel.
“But if this is the word of truth, there is no falsehood in it. How then do you wish to make it false by opening your ear to the words of those who try to shake your faith?
They try to shake the truth that salvation is only in the Lord Jesus, as the Gospel originally taught you,” says blessed Theophylact.