Which preposition to use with gilfillan

in Occurrences 1%

"To me," wrote Cairns to George Gilfillan in 1849, "love seems infinitely higher than knowledge and the noblest distinction of humanitythe humble minister who wears himself out in labours of Christian love in an obscure retreat as a more exalted person than the mere literary champion of Christianity, or the recondite professor who is great at Fathers and Schoolmen.

Which preposition to use with  gilfillan