By love serve

Found this plaque in the garden at William Booth College where I spent one night before moving on to the International College for Officers (ICO). It's interesting in its wording...

It doesn't say "serve with love" or even "with love, serve". I think it's signifcant that it says "By love serve", because unless we serve compelled by love, it won't be true, unselfish, Christ-like service. There must be another reason or reasons for serving. Becuase it is only out of love, or 'by love' that we can truly serve.