Psalms 100 says
1 Make a joyful noise unto the Lord, all ye lands.
2 Serve the Lord with gladness: come before His presence with singing.
3 Know ye that the Lord He is God: it is He that hath made us, and not we ourselves; we are his people, and the sheep of his pasture.
4 Enter into his gates with thanksgiving, and into His courts with praise: be thankful unto Him, and bless His name.
5 For the Lord is good; His mercy is everlasting; and His truth endureth to all generations
We are to come to God with thanksgiving and praise; being thankful and blessing His name. We are to thank Him because He is good. We are to thank Him because His mercy is everlasting and we need it everyday. We are to thank Him for the sacrifice of His Son. We are to thank Him for eternal life.
We are not to be thankful for the material things in our possession. Many of these things we obtain because we work. But what is it that you have that you didn't buy but that was freely given to you and that will sustain and keep you....the LOVE of JESUS CHRIST!