It is a principle universally recognized throughout our system of law, that no person shall be permitted to occupy a position of trust and confidence who at the same time is clearly subject to influences hostile to a faithful performance of his trust. There is a rule as old as Christianity, and it has been incorporated into our law from the earliest times, that "no man shall serve two masters; for either he will hate the one and love the other, or he will hold to the one and despise the other." Fiduciary relations can rest upon no foundation but absolute integrity. Once destroy the inviolate sanctity of the trust relation and the moral basis for social institutions will begin to crumble away. The law has, in this particular, been ever vigilant to ward off the least encroachment upon the high standards of conduct exacted from those who hold positions of trust and confidence.
Sunderland, Edson R. "An Inroad Upon Fiduciary Integrity." Mich. L. Rev. 4 (1906): 349-57.