The quote refers to the skills shown by the wording and tone of voice to convey emotions, thoughts, knowledge, experience, as well as the needs of the speaker, the listener gets to know and respond back to each other.
Speaking skills expressed by means of words, tone and nonverbal signs. To convey emotion Feeling Knowledge, experience As well as the needs of the listener's perception. And responding to each other.
Speak mean skill expression using words, tone and manner to convey emotion, mind, knowledge and experience As well as the needs of the native listeners get to know. And there was a response back to each other.