It is constituent of the definition of personal bonds that — within the limits of character and skill — one trusts one's friends more deeply than strangers … If it were not, the motive for acting on the basis of personal bonds would vanish.

DEFINE: Defines personal bonds by their essential constituent of preferential trust, arguing this trust asymmetry is definitional rather than incidental.

Diego Gambetta, Trust - Making and Breaking…, loc. 2840