Colosse was a city in western Asia Minor, the present Turkey. It was quite near the city of Laodicea and the rest of the seven ecclesias of the Revelation. No mention is made of it in Paul's travels, though it is very likely he visited there.
Paul's epistle to them was, like most of his epistles, written from prison. Paul's concern was never for himself or his own circumstances. For the Gospel's sake he gave up everything. He had no family, no home, no permanent employment. His life was a weary and continual pilgrimage.
This epistle's great theme is the supreme position of Christ in the purpose of God-the necessity in all things of being with him and in him. This basic truth is presented as a bulwark against being led aside by crochets and invented forms of self-righteousness and self-discipline which ministered to pride, and do not get to the root of the problem of overcoming the flesh.
It teaches that true holiness is both beautiful and practical, cleansing and purifying and ennobling every aspect of life, but that there is no value or virtue, but rather harm, in performing self-imposed regulations that God has not required.
Bro Growcott - Every man perfect in Christ Jesus