All 6 Uses

motive
in
The Screwtape Letters
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Is he a man of great physical courage—so great that he will have no half-conscious misgivings about the real motives of his pacifism?†
Chpt 7

motives = reasons for doing something
His real motive for fixing on sex as the method of reproduction among humans is only too apparent from the use He has made of it.†
Chpt 18

motive = reason (for doing something)
In the first place, humans who have not the gift of continence can be deterred from seeking marriage as a solution because they do not find themselves "in love", and, thanks to us, the idea of marrying with any other motive seems to them low and cynical.†
Chpt 18
All His talk about Love must be a disguise for something else-He must have some real motive for creating them and taking so much trouble about them.†
Chpt 19
The reason one comes to talk as if He really had this impossible Love is our utter failure to out that real motive.†
Chpt 19 *
This, indeed, is probably one of the Enemy's motives for creating a dangerous world-a world in which moral issues really come to the point.†
Chpt 29

motives = reasons for doing something

Definitions:

(1) (motive as in: What is her motive?)
a reason for doing something
(2) (meaning too rare to warrant focus)
Less commonly, motive can refer to something that causes motion in an inanimate object. Even less commonly, it can refer to a distinctive feature in music, art, or literature.