A pond holds its shape by doing very little. Water arrives from one side, leaves from the other, and in between it settles enough that you can read the bottom.

Reading is the same. A page that settles gives the eye a floor to stand on, and the reader stops noticing the letters at all. That is the whole trick of body type: it should disappear while it is working.

A heading can be loud. The paragraph under it has to be patient.

Set a long passage in a display face and the surface never stops moving. Set it in a face built for text and the ripples stay where you put them, at the title, at the pull quote, at the one word you meant to stress.

Judge the pair here, at paragraph length, before you judge it on a specimen sheet.