John Wesley on 1 Corinthians 7:40

I also - As well as any of you. Have the Spirit of God - Teaching me all things This does not imply any doubt; but the strongest certainty of it, together with a reproof of them for calling it in question. Whoever, therefore, would conclude from hence, that St. Paul was not certain he had the Spirit of Christ, neither understands the true import of the words, nor considers how expressly he lays claim to the Spirit, both in this epistle, 1Co 2:16, 14:37, and the other. 2Co 13:3. Indeed, it may be doubted whether the word here and elsewhere translated think, does not always imply the fullest and strongest assurance. See 1Cor 10:12.