Akhil Bharat Vivekananda Yuva Mahamandal is a youth organization devoted the 'man-making, character-building' ideal of Swami Vivekananda. There is a unit of the organization at Kalyani, where Arup was associated for nearly ten years. At the age of 13, when he was a student of class IX, he came to the Kalyani Vivekananda Yuva Mahamandal, first as a student. He never gave it up. He adored the ideal of Swami Vivekananda - the ideal of man-making and service to humanity - by heart. He gradually started studying Swamiji's books and practising mental concentration, prayer for the well-being of all, etc. He attended zonal and daylong youth training camps. He was already a very good boy by nature. Here he found the rationale for being out and out honest and devoted to 'being good and doing good' - the simple message of the Buddha and Vivekananda. As he grew from adolescence to early youth, his involvement with the Mahamandal deepened. He attended the All India Annual Youth Training Camp 2008 of the Akhil Bharat Vivekananda Yuva Mahamandal at Gangadharpur and worked a lot for its Kalyani unit. He was the Assistant Secretary of the unit for the year 2012-2013. He took active roles in organizing programmes, including Swami Vivekananda's birthday celebrations, daylong camps, bookstalls at book fairs, etc. He also assisted in editing as well as distributing the monthly organ of the Mahamandal, 'Vivek-Jivan'. Several young men were inspired by him and associated themselves with the work. Another aspect which is not less important than work is friendship. Here he had a joyful and friendly environment of abiding love. His association with his 'Dada', Dipak-da, Sudhir-da, Santosh-da, Shubhadeep, and others proved to be time-tested. Everybody loved him, as he radiated joy. (And it was natural for him to easily suppress his own problems.) Serious discussions alternated with untainted fun. Gone are those days! In all programmes of the Mahamandal at Kalyani he was in the work of decoration. He could blend fine aesthetic sense with exigencies of work and financial constraints. On 23 Jan 2010 he visited a local brick kiln for photography. But the plight of the working children touched his tender heart. Next day he reported the experience at the weekly study circle of the Mahamandal and asked if anything could be done. Immediately a team was formed and they visited the kiln. This was the genesis of the literacy-cum-awareness programme run by the Kalyani unit of the Mahamandal. His agony for the deprived working children has become vocal in his Bengali article, 'Amader Dayitva' (Our Responsibility) published in 'Diganta', a quarterly magazine from Barrackpore. Association with the Mahamandal was a blessing. He really developed himself as expected. Unusual for his age, he had clear concepts, practical sense, great work efficiency, keen interest for perfection in everything, and - above all - intense feeling for deprived children. His life reminds one of the famous Sanskrit saying: "Muhurtam jvalitam shreyah, na tu dhumaayitam chiram" - it is far better to live a short life of Fire, emitting effulgent Light, than to smoulder for ages. He was physically fit. He understood the political and economic situation of the country very well. He is admired for his honesty, sense of decency, and power of empathy that surpass what common people would ever aspire for. If such rare ones pass away prematurely, who will fill the vacuum?