Nepalgunj, July 30 Nepali Congress leader Shekhar Koirala has stressed on unity among the political parties to implement the new constitution. Participating in a discussion on ‘BP’s thought and its relevance’ organised by the Nepali Congress on Saturday, leader Koirala said BP Koirala’s thoughts still had relevance. NC district president Kiran Koirala, former district presidents of the party Yubraj Sharma, Sanat Regmi, Tappa Paudel and Niranjan Singh Sijapati said BP’s ideologies would continue to guide the Nepali Congress.