Answer:
Because it comes from within the person.
Step-by-step explanation:
In business, we learn about the concept of internal force and external force as two factors that could influence the outcome of a certain event.
External forces are the type of influences that come from our environment. Generally, it's not something that we can control. We have to make proper adaptation to address the external forces to prevent it from ruining our goals.
Example of External Goals : Natural disaster, Future laws made by the government, etc.
Internal forces on the other hand are the type of influences that come from within ourselves as a person. It is something that we can control and constantly thrive to improve in order to make it easier for us to achieve our goals.
Example of internal goals: Strength, Emotional stability, Motivation, etc.