The Apostle Paul
Colossians 1:4ESV·traditional attribution

since we heard of your faith in Christ Jesus and of the love that you have for all the saints,

John Calvin Reformed @genevareformer

4. Having heard of your faith. This was a means of stirring up his love towards them, and his concern for their welfare, when he heard it that they were distinguished by faith and love. And, unquestionably, gifts of God that are so excellent ought to have such an effect upon us as to stir us up to love them wherever they appear.

Matthew Henry Presbyterian @wholebiblehenry

Here he proceeds to the body of the epistle, and begins with thanksgiving to God for what he had heard concerning them, though he had no personal acquaintance with them, and knew their state and character only by the reports of others. I. He gave thanks to God for them, that they had embraced the gospel of Christ, and given proofs of their fidelity to him.

Commenting on Colossians 1:3-8

John Gill Reformed Baptist @doctorgill

Since we heard of your faith in Christ Jesus,.... This expresses the matter of their thankfulness, or what it was they gave thanks to God for, their faith in Christ; by which is not only meant their hearty assent to the whole doctrine of faith, concerning the person, offices, and grace of Christ, their soundness and steadfastness in it, and their sincere and constant profession...