Which preposition to use with rightness

of Occurrences 18%

But it wasn't difficult to guess; and before Duchemin was finished he had testimony to the rightness of his surmise, finding himself the cynosure of more than a few pair of eyes set in the ill-favoured faces of natives of La Roque.

in Occurrences 1%

The Poet is not careful of what is called poetic justice in his play, though therein is no failure; what he is careful of is personal rightness in the hero of it.]

Which preposition to use with  rightness