All this the reader unconsciously perceives, and will not think the language to be natural unless the proper variations be there.
In simple narrative the rule is the same as in dialogue, though it does not admit of the same palpable deviation from correct construction.

The story of any incident, to be realistic, will admit neither of sesquipedalian grandeur nor of grotesque images.

The one gives an idea of romance and the other of burlesque, to neither of which is truth supposed to appertain.

We desire to soar frequently, and then we try romance.

We desire to recreate ourselves with the easy and droll.