The voice did not reply, but suddenly I heard a long, beautiful wail which I knew well.

It is the plaint of Lazarus when, at the sound of the Redeemer's voice, he begins to open his eyes and see the light of day.
It was the music which you and I, Raoul, heard at Perros.

And then the voice began to sing the leading phrase, 'Come! And believe in me! Whoso believes in me shall live! Walk! Whoso hath believed in me shall never die! ...' I can not tell you the effect which that music had upon me.

It seemed to command me, personally, to come, to stand up and come to it.

It retreated and I followed.