Never do things others can do and will do, if there are things others cannot do or will not do.
Source, in full
As quoted in Have Fun with American Heroes : Activities, Projects, and Fascinating Facts (2005) by David C. King, p. 82; this is also attributed to Dawson Trotman in Through Her Eyes : Life and Ministry of Women in the Muslim World (2005) by Marti Smith, p. 116