Harmony is that property of style which gives a smoothness to the sentence, so that when the words are sounded their connection becomes pleasing to the ear. It adapts sound to sense. Most people construct their sentences without giving thought to the way they will sound and as a consequence we have many jarring and discordant combinations such as "Thou strengthenedst thy position and actedst arbitrarily and derogatorily to my interests."

Harsh, disagreeable verbs are liable to occur with the Quaker form Thou of the personal pronoun. This form is now nearly obsolete, the plural you being almost universally used. To obtain harmony in the sentence long words that are hard to pronounce and combinations of letters of one kind should be avoided.