Ephesians 5:20 “Always give thanks to God the Father for everything, in the name of our Lord Jesus Christ.”
1 Thessalonians 5:16-18 “Be joyful always; pray continually, give thanks in all circumstances for this is God’s will for you in Christ Jesus.”
The verse from Ephesians occurs at the end of a paragraph which starts out “Be very careful, then how you live–not as unwise but as wise,” (v. 15) and “do not be foolish, but understand what the Lord’s will is” (v.17). The literary device of contrasting wisdom and foolishness is meant to grab our attention; so is the device of repeating a similar thought or idea. Using both of them must mean what follows is very important.
Verse 17 says “do not be foolish, but understand what the Lord’s will is”, 1 Thessalonians 5:18 tells us what the Lord’s will is–“give thanks in all circumstances.” It follows then, that a lack of thankfulness on our part is not only contrary to the Lord’s will for our lives, but it constitutes foolishness as well!