Which preposition to use with unessentials

to Occurrences 2%

It is in this sense that Shakespeare's productions are most dramatic; he wins the reader by his mode of treatment, of disclosing man's innermost life; the demands of the stage appear unessential to him, and thus he takes an easy course, and, in an intellectual sense, we serenely follow him.

for Occurrences 1%

The development of philosophy is, perhaps, one chief aim of the world-process, but it is certainly not the only one; it is a part of the universal aim, and it is not surprising that the instruments of its realization do not work exclusively in its behalf, that their activity brings about results, which seem unessential for philosophical ends or obstacles in their way.

in Occurrences 1%

Infirmaries should be established for the purpose of making the stupid interesting, or classes organized on "How to be Brief," or on "The Art of Relating Salient Points," or on "The Best Method of Skipping the Unessentials in Conversation.

Which preposition to use with  unessentials