Contradiction with 1 Corinthians 2:4–5
While 1 Thessalonians 1:5 emphasizes the gospel coming in power and the Holy Spirit, 1 Corinthians 2:4–5 stresses not relying on human wisdom or persuasive words but on God's power, seemingly contrasting the emphasis on spirit vs. wisdom.
Contradiction with John 6:63
Where 1 Thessalonians 1:5 mentions the gospel coming not just in word but in power and the Holy Spirit, John 6:63 emphasizes that it is the Spirit that gives life, while human effort (the flesh) is ineffective, suggesting a potential tension in the perception of 'power'.
John 6:63: It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, [they] are spirit, and [they] are life.
Contradiction with 1 Corinthians 1:17
This verse suggests that the power of the gospel is not in eloquent wisdom, which could be seen as contradicting the idea of the gospel coming in power and assurance as indicated in 1 Thessalonians 1:5.
1 Corinthians 1:17: For Christ sent me not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect. [words: or, speech]