Colossians 1:3

We give thanks to God
Meaning himself and Timothy. This is the beginning of the epistle, which is introduced with a thanksgiving to God; to whom praise and thankfulness are always due as a Creator and preserver, as the author of all good things, as the Father of mercies, temporal and spiritual, and as the covenant God and Father of his people through Christ: wherefore it follows,

and the Father of our Lord Jesus Christ;
the sense of which either is, that God the Father, who is the object of praise and thanksgiving, is both the God of Christ, and the Father of Christ, the God of Christ, as Christ is man, and the Father of Christ, as Christ is God; or the latter is exegetical of the former, and may be rendered thus, "God, even the Father of our Lord Jesus Christ": and very properly are thanks given to him under this character, because it is as he is the Father of Christ that he blesses his people with all spiritual blessings; and because he is their God, as well as his God; and their Father, as well as his Father, though in a different sense, his by nature, theirs by adoption. Moreover, as all their blessings come from God, as the Father of Christ, and through Christ, and for his sake, so it is very proper that thanks should be returned unto him under that character; and through Christ, by whom alone such sacrifices of praise are acceptable to God: it is added,

praying always for you;
which, as it is expressive of the constant discharge of the duty of prayer, and the continual remembrance of these saints in it, and shows the affection the apostle had for them; so it points out the time when, and the way and manner in which Paul and Timothy gave thanks to God on account of them; it was when they were at the throne of grace, and in their frequent prayers to God; thankfulness for mercies received, both by ourselves and others, being a branch of the duty of prayer.