Which preposition to use with soother

of Occurrences 10%

[Footnote 11: "These subjects ... have been to me the solace of a long life, the delight of many quiet days, and the soother of many troubled ones ... a source of enjoyment.

as Occurrences 1%

He knows that some men who drink are unreliable, and that unreliable men are apt to represent unreliable houses and to sell unreliable goods, and he hasn't the time or the inclination to stop and find out that this particular salesman has simply had a mild snort as an appetizer and a gentle soother as a digester.

Which preposition to use with  soother