Neuroscientists who study motivation and learning understand that our environment and daily events activate specific brain structures and shape our beliefs and actions.

When behavior has strength and intensity, we attribute this to the presence of energy. When our behavior is aimed or directed toward some particular goal or outcome, it is said to have a purpose. When the behavior endures and is sustained over time and across different situations, it implies persistence. 

When we are motivated, we take action. 

Taken from:

https://positivepsychology.com/motivation-science-research-assessments/