I'm looking for a short story written before 1998.
Telepathy had been discovered and early experiments picked up thoughts from distant alien civilisations, which were vast and highly advanced. The aliens were unaware of Earth and nobody so far had found a way to make them hear us - human thoughts were too "quiet" for them to notice.
A star was discovered on a collision course with Earth and humans didn't have the technology to divert it or escape. The only hope was to attract some of the aliens' attention, since they would be easily able to help. Someone came up with a plan to create a mental "shout" by having everyone on Earth focus on the same thing at the same time.
Emotions were known to carry well in telepathy, so the most powerful human emotion was suggested. A device was available to enhance people's emotions, but everybody would have to choose to use it. The story finished with one of the proposers promoting the plan using the quote in the title.