"The knowledge of true love", a Jewish teacher once told his pupil,
"I owe to two countrymen I have listened to. One said: 'Tell me dear Ivan,
do you love me?' The other answered: 'Of course I love you!' The first asked:
'Do you know what hurts me?' The other answered: 'How can I know that?'
The first one then said: 'If you don't know what hurts me, then how can you
say you love me?' - "Do you understand", concluded the Jewish teacher,
"Love, true love, means to know what hurts others."