Narendra Modi today mocked at Prime Minister Manmohan Singh while addressing overseas Indians at the ongoing 'Pravasi Bharatiya Diwas' meet.br br "The Prime Minister said a good thing yesterday that we should not lose heart, good days are coming soon. I don't need want to say anything more. You may have to wait four-six months but better days are coming," Mr Modi said, referring to Dr Singh's address to the same gathering on Wednesday.