noun
BAD : I hope your trip will provide impulse for the essay you will have to write when you get back.
GOOD : I hope your trip will provide inspiration for the essay you will have to write when you get back.
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impulse = a sudden desire to do something: 'I had a sudden impulse to walk out of the classroom and never return.' 'It's unwise to act on impulse.'
inspiration = (a source of) creative energy: 'The inspiration for these early poems came from his relationship with Lucy Potter.'