Romans 1:21; For although they knew God, they neither glorified him as God nor gave thanks to him, but their thinking became futile and their foolish hearts were darkened.
It is interesting that thankfulness is an important part of out spiritual lives. When we are not Romans 1 says a bad thing happens.
Our thinking becomes futile. This means powerless, pointless, worthless.
Futile thinking is being focused on false things not the things that true.
Futile thinking keeps us giving credit to the enemy of our souls.
Futile thinking focuses on what is not right rather than having a thankful heart for what is right.
Consequently, our hearts become foolish and become darkened.
The end result is that God Gives us over to the lusts of their hearts to impurity (1:24), to degrading passions (1:26), a depraved mind (1:28).
Thankfulness is a good thing!