On the other hand, he may pass off a real or pretended crudeness of speech as the credentials of the prophet who does not come «with persuasive words of wisdom», but who humbly brings the treasure of the Gospel «in earthen vessels». (religion-online.org)
Students become familiar with persuasive words and learn proper posture, enunciation, body language, gestures, voice quality, and eye contact. (educationworld.com)
For I was with you in much weakness, fear and trembling; and my speech and my message were not persuasive words of wisdom, but the demonstration of spirit and power, that your faith might not rest in the wisdom of men but in the power of God [I Cor. (religion-online.org)