rooted and built up in Him and established in the faith, as you have been taught, abounding in it with thanksgiving.
God’s desire is for us to be “established” in the faith, walking by faith, and not by sight. One of the most important lifestyle changes that must take place in the life of a believer to stop waking by sight; talking about and being focused on what one see, always speaking defeat, negative, and magnifying what one sees instead of what God has said and done through Christ is thanksgiving.
Notice in the above verse the apostle Paul tells believers in Colossians that they had been taught how to be established in the faith, abounding in it (faith) with thanksgiving. For you to abound in faith, believing in what Christ has already provided for you through His death, burial, and resurrection all that is needed in this life you are living, you are to thank Him for what He has already done.
If you develop in a life of thanking God for having made you more than a conqueror, redeeming you from the works of darkness, etc, your focus is on what God’s Word declares, and not on what is happening around you. You cannot live a life of thanksgiving toward God and be focused on things in the natural . Faith will change what is seen, for all things are possible for them who believe. Develop a daily life of thanksgiving toward God, and you can see your faith abound more and more.