Using the definition of caesura as a deliberate pause, Mark Twain (pen name of Samuel Langhorne Clemens)  had this to say in -- Mark Twain's Speeches (1923 edition):
   "No word was ever as effective as a rightly timed pause.".

Twain also said this, in -- Autobiographical dictation, 11 October 1907. Published in Autobiography of Mark Twain, Volume 3 (University of California Press, 2015).
   "That impressive silence, that eloquent silence, that geometrically progressive silence which often achieves a desired effect where no combination of words howsoever felicitous could accomplish it.... For one audience, the pause will be short; for another a little longer; for another a shade longer still; the performer must vary the length of the pause to suit the shades of difference between audiences. ... I used to play with the pause as other children play with a toy."
 

1 hour ago, ReaderPaul said:

Using the definition of caesura as a deliberate pause, Mark Twain (pen name of Samuel Langhorne Clemens)  had this to say in -- Mark Twain's Speeches (1923 edition):
   "No word was ever as effective as a rightly timed pause.".

Twain also said this, in -- Autobiographical dictation, 11 October 1907. Published in Autobiography of Mark Twain, Volume 3 (University of California Press, 2015).
   "That impressive silence, that eloquent silence, that geometrically progressive silence which often achieves a desired effect where no combination of words howsoever felicitous could accomplish it.... For one audience, the pause will be short; for another a little longer; for another a shade longer still; the performer must vary the length of the pause to suit the shades of difference between audiences. ... I used to play with the pause as other children play with a toy."
 

This is especially true when speaking to an audience, rather than in print, but it works both ways.