“Warmth is the soul of the voice.” 
In Psalm 149, the psalmist called for God’s people to express praise to Him in words and actions: “Hallelujah! Sing to the Lord a new song…let the exaltation of God be in their mouths.” Exaltation or praise is to be reinforced by a joyful shout. The sound of the voice conveys the emotions and feelings of the heart. A Christian should offer praise to the Lord with her whole self.
Haddon Robinson explained the influence of the voice in his book, Biblical Preaching:
Speech consists of more than words and sentences. The voice conveys ideas and feelings apart from words. We make judgments about a speaker’s physical and emotional state—whether he is frightened, angry, fatigued, sick, happy, confident—based on the tenor of his voice, its loudness, rate, and pitch.
Chapter 21 of our book establishes the importance of nonverbal communication to express emotions and feelings, focusing on three aspects of vocal tone which project meaning: volume, variety, and vibrancy. For the purpose of this blog, we will focus on vibrancy.
Vibrancy refers to the enthusiasm and passion communicated in the tone of a speaker’s voice. An animated and energetic voice adds emotions and feelings to the spoken words. Public speakers should desire vocal vibrancy and lively delivery in speech delivery. Vibrancy in the voice should make the listener want to hear the speech.
Energy is expended physically when speaking. Verbal and nonverbal communication involves energy and effort. Public speakers need to maintain physical as well as mental health to communicate more effectively. Proper nutrition, regular exercise, and adequate rest are essential ingredients of energetic speaking. Fatigue and illness hinders enthusiasm and vibrancy in speaking.
Warmth is an aspect of emotion which can be expressed verbally or nonverbally. Tender feelings can be communicated through choice of words or tone of voice. A softer, lower voice typically conveys warmth. Warmth should be a vocal quality desired by public speakers.
In an etiquette book written in 1942, Margery Wilson suggested that the voice reflects emotions as surely as a mirror reflects an image. Warmth is the “soul” of the voice. Sweetness, generosity, and love of humanity are personal qualities of the inner person that produce warmth in a speaker’s voice. Wilson recommends that people build character and virtues to speak with vocal warmth.
Excitement and eagerness should be experienced and expressed by the speaker. If the speaker does not sound excited about the topic, the audience will not want to listen. When possible, a speaker should select a topic of personal interest. If the assigned topic is less than stimulating, the speaker can express enthusiasm verbally. Vocal vibrancy depends upon energy, warmth, and excitement.
Consider these principles about vocal vibrancy when delivering a speech.
- Determine the presence or absence of vibrancy in your voice.
- Compare your vocal vibrancy to that of other speakers.
- Prepare physically for speaking with proper sleep, nutrition, and exercise.
- Work to soften the tone of your voice to convey warmth.
- Expand your interest to be enthusiastic about the topics for your speeches.
The voice provides insight into the speaker’s emotions and feelings. The vocal characteristics of volume, variety, and vibrancy combine with words and other nonverbal cues to communicate the meaning of the speaker’s message. A simple sentence such as “I have had a good day” can change meaning drastically when the voice is used differently. Soft volume may raise doubt in the listener; loud volume may cause belief in the statement. Vocal variety may keep the interest of the listener; limited variety may lose attention. Vocal vibrancy may convey passion to listeners; flat, monotonous tone sounds unconvincing. Tone of voice is the nonverbal code for expressing emotions and feelings in public speaking.
The sound of the voice conveys the emotions and feelings of the heart.
 Margery Wilson, The Woman You Want to Be: Margery Wilson’s Complete Book of Charm (Philadelphia: J.B. Lippincott Company, 1942), 58-59.
 Haddon Robinson, Biblical Preaching (Grand Rapids, MI: Baker Books, 1980), 202-203.