Romans 1:20-22 (New International Version)
20For since the creation of the world God's invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that men are without excuse.
21For 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. 22Although they claimed to be wise, they became fools.

The passage pictures a time when men had the knowledge of God. Mankind had in their possession truths about the invisible qualities of the author of life.

Paul tells us that the response of mankind to the evidence of God's existence was a choice not to worship him or give thanks. Romans 1:21 tells us that the reward of an ungrateful heart is futile thinking and a darkened heart.

Gratitude is a powerful and indispensable aid to your own mental health.

In the original language the word futile indicates that the expected results were not achieved.

A mind that is ungrateful will always bring about futile thinking, which implies going no where. It implies going in circles. Around and around: with no clear direction or destination.

Just as physical fitness can keep our bodies strong and healthy, mental fitness helps us to achieve and sustain a state of good mental health.

When we are mentally healthy, we are able to enjoy our life and the people in it. The God who created you has left us strong words of advice on how to enjoy our life, our environment and the people in it.

Phi 4:11-13 KJVR
(11) Not that I speak in respect of want: for I have learned, in whatsoever state I am, therewith to be content.
(12) I know both how to be abased, and I know how to abound: every where and in all things I am instructed both to be full and to be hungry, both to abound and to suffer need.
(13) I can do all things through Christ which strengtheneth me.