UPA Chairperson Sonia Gandhi said on Saturday that former Delhi Chief Minister Sheila Dikshit guided her "more like an older sister than party colleague" when she became party chief in 1998 and described her as "the best and most effective chief minister we have had".Delivering the Sheila Dikshit Memorial speech here, Sonia Gandhi recalled her association with the late leader who passed away on July 20 and said her life "teaches us that that there is nothing more worthy for a public person than genuine service of the people".Gandhi said Dikshit was "a remarkable individual, a proud party colleague and an exemplary woman leader"."Rarely does history bring together compassion, statesmanship, efficiency and stamina in one person. Sheilaji was one such example in recent times," she said.Gandhi said no one understood the real importance - or weight -- of responsibility better than Dikshit."She was not one to shy away from shouldering hers, no matter what challenges she confronted. A ...