It takes real work to have a sense of gratitude, or readiness to show appreciation. I would argue that it's actually not natural to be thankful. The heart is stubbornly selfish, and even if we are grateful for a moment, the next moment may find us wanting. Or worse, bitter and unappreciative.  I know this because even those whose very lives have been spared - who have every reason to be overpouring with gratitude, will find themselves struggling to display sustained thanks in every situation. This is true for believers in Christ. Rescued from eternal damnation, we live our lives at times in indisproportional gratitude and praise to the One who authored it all. 

For my ungrateful self it takes work to undo the natural tendencies of the heart. God's Word in all its authority has its way of piercing my calloused heart:

For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God. - 2 Corinthians 5:21

For you know the grace of our Lord Jesus Christ, that though he was rich, yet for your sake he became poor, so that you by his poverty might become rich. - 2 Corinthians 8:9

Amen. May we all learn to be ever more grateful for our great riches in Christ.