In chapter ten of The Art of Prophesying, Perkins writes the following:
“Such a ‘demonstration’ [of the Spirit] will come to expression either in speech or in gesture. The speech must be spiritual and gracious. Spiritual speech is speech which the Holy Spirit teaches (1 Cor. 2:13). It is both simple and clear, tailored to the understanding of the hearers and appropriate for expressing the majesty of the Spirit (Acts 17:2,3; 2 Cor. 4:2-4; Gal. 3:1). For this reason none of the specialized vocabulary of the arts, nor Greek and Latin phrases, nor odd turns of phrase should be used in the sermon. These distract the minds of those listeners who cannot see the connection between what has been said and what follows. In addition, unusual words hinder rather than help people in their efforts to understand what is being said. And they also tend to draw their minds away from the subject in hand to other things. In this connection, too, mere story-telling as well as vulgar or foolish statements must be avoided.”
Remember, this was written over four-hundred years ago: indeed, there is nothing new under the sun!