All 4 Uses

motivation
in
The Duck Commander Family
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Once I saw that Mom was more likely to spend some of that cash we made on something I wanted at the store if I did a good job that day, that was just the motivation I needed to work on my craft.†
p. 74.8

motivation = the reason for doing something; or the level of desire to do something
This was also my motivation to start being good at business, so I could provide enough money for all these younguns.†
p. 147.9 *
His reluctance gave me the motivation to make sure it was successful.†
p. 186.9
I think what Willie brought to the family business was energy, innovation, direction, and motivation, which are attributes that a leader has to have.†
p. 218.2

Definitions:

(1) (motivation)
the reason for doing something; or the level of desire to do something
(2) (meaning too rare to warrant focus)