Christian Unity

The observable and practical love among true Christians that the world has a right to be able to observe in our day certainly should cut without reservation across such lines as languages, nationalities, national frontiers, younger and older, colors of skin, levels of education and economics, accent, line of birth, the class system in any particular locality, dress, short or long hair among whites and African and non-African hairdos among blacks, the wearing of shoes and the non-wearing of shoes, cultural differentiations and the more traditional and less traditional forms of worship. 

  -- p30, The Mark of the Christian by Francis Schaeffer (2nd edition, IVP, 2006)