Prime Minister Ranil Wickremesinghe addressing the National Programme titled 'Teach if you know- Learn if you don't know' held with the facilitation of the Sri Lanka Broadcasting Corporation (SLBC) at the Sugathadasa Stadium in Colombo on July 26 said people unite when they understand each other, reports Daily News. Sri Lanka could come forward as a peaceful and developed nation when its people become competent in two official languages of the country, Prime Minister Ranil Wickremesinghe said.