Do not say that they have been given eloquence to aid the truth-Imaam Muhammad Ibn Saaleh Al-Uthaymeen (rahimahullaah)
It is obligatory to be cautious of those ones who make false affairs fair seeming to the people by way of adorned speech—be it in affairs of Aqeedah, Manners or Manhaj. Their statements and actions are to be presented to the Book of Allaah and the Sunnah of Allaah’s Messenger (for examination); so whatever affair they oppose (in the Book and the Sunnah, then their views and actions are regarded to be) falsehood, regardless of what it may be, and one is not to be deceived by what is contained in it of adorned speech, because as the saying goes: ”Adorned speech is an erroneous proof, such as a glass that is truly broken and every broken (glass) is shattered.” And do not say that those people have been given eloquence and the ability to speak clearly in order to aid the truth, for indeed Allaah (The Most High) may put people to the test, so a person may be given eloquence and the ability to speak clearly even though he is upon falsehood, just as Allaah will put the people to trial by way of the Dajjaal, whilst-without a doubt—the Dajjaal is upon falsehood. [Slightly Paraphrased] [1]
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[1] Source: Sharh Munti. Vol 3. Page: 198]