Rejoice evermore. Pray without ceasing. In every thing give thanks: for this is the will of God in Christ Jesus concerning you. – 1 Thessalonians 5:16-18

The position of our text is very suggestive. Observe what it follows. It comes immediately after the precept, “Rejoice evermore;” as if that command had somewhat staggered the reader and made him ask “How can I always rejoice?” and, therefore, the apostle appended an answer, “Always pray.” The more praying the more rejoicing. Prayer gives a channel to the pent-up sorrows of the soul; they flow away, and in their stead streams of sacred delight pour into the heart. At the same time the more rejoicing the more praying; when the heart is in a quiet condition, and full of joy in the Lord, then also will it be sure to draw nigh unto the Lord in worship. Holy joy and prayer act and react upon each other.

Observe, however, what immediately follows the text: “In everything give thanks.” When joy and prayer are married their first-born child is gratitude. When we joy in God for what we have, and believingly pray to Him for more, then our souls thank Him both in the enjoyment of what we have, and in the prospect of what is yet to come. Those three texts are three companion pictures, representing the life of a true Christian, the central sketch is the connecting link between those on either side. These three precepts are an ornament of grace to every believer’s neck, wear them every one of you, for glory and for beauty; “Rejoice evermore;” “Pray without ceasing;” “in everything give thanks.” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1039.cfm