It may well be that ethical language has primarily a motivative function.    From Wordnet, Princeton University. 

This was distinguished from the expression and appeal functions, i.e., mainly the pictorial, the emotional, and the motivative uses of communication.    From Wordnik.com.  [Dictionary of the History of Ideas] Reference

The sort of metaphysics that was repudiated was said to arise out of mistaking noncognitive (picto - rial, emotional, motivative) significance for genuinely cognitive (representative) meaning.    From Wordnik.com.  [Dictionary of the History of Ideas] Reference

Pleasure is all mine Aritdas and thanks in tons for such +ve and motivative words.    From Wordnik.com.  [LearnHub Activities] Reference

Be a self motivative and creative person to make new jobs and to create new atmosphere.    From Wordnik.com.  [SiliconIndia.com] Reference

I am a self-motivative person.    From Wordnik.com.  [erraticwisdom] Reference