be concrete when experissing ideas

Captions from The Elements of Style

• 15 Put statements in positive form.
  

  … Consciously or unconsciously, the reader is dissatisfied with being told only what is not; the reader wishes to be told what is.

• 16 Use definite, specific, concrete language.
  

  … If those who have studied the art of writing are in accord on any one point, it is this: the surest way to arouse and hold the reader’s attention is by being specific, definite, and concrete.