The correct answer to this open question is the following.
Although there are no options attached or further context or references, we can comment on the following.
The instances where a personal struggle for power are when this individual is greedy and has ambitions over his own capabilities. That is when he/she starts to envy the things that belong to others or it is not satisfied with what it has and ambitions more and more. This individual tries to get the power to control and influence other people. It tries to manipulate them to get results and promote their personal interests and agenda.