A Rabbi gathered together his students and asked them:
‘How do we know the exact moment when night ends and day begins?’
‘When it’s light enough to tell a sheep from a dog?’ said one boy.
Another student said: ‘No, when it’s light enough to tell an olive tree from a fig tree.’
‘No, that’s not a good definition either.’
‘Well, what’s the right answer?’ asked the boys.
And the Rabbi said:
‘When a stranger approaches, and we think he is our brother, and all conflicts disappear, that is the moment when night ends and day begins.’