NET
17 What I am saying with this boastful confidence I do not say the way the Lord would. Instead it is, as it were, foolishness.
Darby
17 What I speak I do not speak according to [the] Lord, but as in folly, in this confidence of boasting.
KJV
17 That which I speak, I speak [it] not after the Lord, but as it were foolishly, in this confidence of boasting.