According to Russell sensitiveness is all important without which other qualities such as courage, intelligence and vitality are meaningless. Each man has sensory organs which ought to be sensitive in order to perceive the ideas, the thoughts that happens in the surroundings at each moment.
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These ideas get into the mind through sensitiveness, The intelligence interprets it and orders courage to work upon it. Courage takes the help of vitality to jump into action. So, sensitiveness is a positive aspect. Admiring beauty or the hero is a good sensitiveness which creates good emotion. A man be courageous; but if he lacks sensitiveness his courage will be futile.