'As a Fool' in the Bible

And the king lamented over Abner, and said, Died Abner as a fool dieth?

He goeth after her quickly, as an ox goeth to the slaughter, or as a fool to the correction of the stocks;

I say again, Let no man think me a fool; if otherwise, yet as a fool receive me, that I may boast myself a little.

Are they ministers of Christ? (I speak as a fool) I am more; in labors more abundant, in stripes above measure, in prisons more frequent, in deaths often.