Some folks hesitate to seize additional strength because they think it wrong or dangerous to be a powerful individual. Somehow they have acquired the false notion that tyranny or dictatorship or cruelty are the outcomes of a powerful personality. These characteristics are not power. They are weaknesses disguised as power.
A certain number of people seek power over other people in a desperate attempt to find themselves. They fail, for self-discovery is spiritual in nature, not social or political. Authoritatively telling other people what to do is their distraction from an inner emptiness they can never fill.
Personal power gives you a sense of accomplishment. It enables you to live fully and zestfully. It provides you with a mature reason for liking yourself better. To state it another way, it is the mark of a healthy and well-adjusted individual to seek self-advancement by mastering his human relations.