Blessed be God, even the Father of our Lord Jesus Christ, the Father of mercies, and the God of all comfort – 2 Corinthians 1:3

Are we to be always receiving and never to return thanks? Aristotle rightly observes: “A return is required to preserve friendship between two persons,” and as we have nothing else to give to God except gratitude, let us abound therein. If we have no fruit of the field, let us at least render to Him the fruit of our lips. Have you no thanks to bring? How, then, can you expect further favours? Does not liberality itself close its hand when ingratitude stands in the way? What, never a word of gratitude to Him from whom all blessings flow! Then may even the ungodly despise you. It would argue great selfishness if we did not combine praise with prayer. Can it be right to think only of ourselves, to pray for benefits and never honour our Benefactor?…What, no thought for God’s glory? No idea of magnifying His great and blessed name! God forbid that we should fall into a spirit so mean and narrow. Healthy praise and thanksgiving must be cultivated, because they prevent prayer from becoming overgrown with the mildew of selfishness.

Thanksgiving also prevents prayer from becoming an exhibition of the want of faith; for indeed some prayer is rather a manifestation of the absence of faith than the exercise of confidence in God. If when I am in trouble I still bless the Lord for all I suffer, therein my faith is seen. If before I obtain the mercy, I thank God for the grace which I have not yet tasted, therein my faith is manifest. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1469.cfm