…when they knew God, they did not glorify Him as God, neither were they thankful. – Romans 1:21

Some live in the presence of God, so they tell us, and they are full of divine delights, but yet they are greatly afflicted with aches and pains, and all the dolors of rheumatism, and therefore they murmur. I admit that rheumatism is a dreadful pain enough, but at the same time to dwell always on the dark side of things, and to forget our mercies, is a sad instance of ingratitude. We are few of us as thankful as we ought to be; and there are some people who are not thankful at all, for instead of a song concerning their mercies, their life is one long dirge for their miseries. Must we always hear the sackbut? Is the harp never to give forth a joy-note?

Some show their unthankfulness by fretting under their supposed ills. They know from Scripture that even their afflictions are working for their good, yet they do not rejoice in the prospect, or feel any gratitude for the refining process through which the Lord is passing them. Heaven and perfection are left unsung, but the present processes are groaned over without ceasing. Their monotonous note is always this pain, this loss, this burden, this uncomfortable sensation, this persecution from the world, this unkindness from the saints, and so on; all this goes to show that, though they know God, they do not glorify Him as God, neither are they thankful.

We can be guilty of unthankfulness, also, by never testifying to the goodness of God. A great many people come in and out of your houses; do you ever tell them about God’s goodness to you? Did you ever take up a single ten minutes with the tale of the Lord’s lovingkindness to you? Oh, what backwardness there is to testify to God as God, and to all His goodness and love! Our mouths are full of anything rather than the goodness of the Lord. Shame on our wicked lips! ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1763.cfm