Even in his early boyhood, Narendranath demanded intellectually convincing arguments for every proposition. He often used to swing on the branches of a champaka tree in a neighbours compound. This irritated the owner, an old man, and he warned Narendranath and his companions that the tree was haunted by a bad ghost who would some day break their necks. This frightened the other boys ; but Narendranath argued that if the old man were right, their necks would have been broken long ago. And he continued to swing on the branches of the tree as before.
Narendranath was gifted with a multiplicity of talents and he cultivated them all. His leonine beauty was matched by his courage ; he had the build of an athlete, a delightful voice, and a brilliant intellect. His interests ranged from fencing, wrestling, rowing, games, physical exercise, cooking and organising dramas to instrumental and vocal music, love of philosophic discussion, and criticism. In all these he was an undisputed leader. These and other traits in his character soon attracted the notice of his teachers and fellow students. The principal of his college, Professor Hastie, once remarked: Narendra is a real genius. I have travelled far and wide, but have not yet come across a lad of his talents and possibilities even among the philosophical students in the German universities. He is bound to make his mark in life.