The phrase "a source of perpetual" is correct and usable in written English.
It can be used to describe something that continuously provides or generates a particular quality or effect over time.
Example: "The ocean is a source of perpetual inspiration for artists and writers alike."
Alternatives: "an endless source of" or "a constant source of".
Love is a source of perpetual anxiety and incompletion.
"The sun is a source of perpetual energy, yet we're not harnessing that.
The divvying up of jobs is a source of perpetual tension within the UN.
It is a source of perpetual wonder that the people of Europe tolerate this robbery.
Its sweeping and expensive journalistic vision, first articulated by The Inquirer's best-known former editor, Eugene L. Roberts Jr., became a source of perpetual friction.
Snape's dalliance with the Death Eaters may have been unforgivable, but his lifelong grievance against James Potter proved to be justified, and the intensity of his mixed motives was a source of perpetual unpredictability and, in the end, tremendous pathos.
At first, Magdy had been a source of buoyant optimism, and perpetual energy: by night, he'd join in the clashes against Mubarak's thugs; by day, he spirited around Tahrir jotting down any jokes he heard.
Zeus was well known for his amorousness a source of perpetual discord with his wife, Hera and he had many love affairs with both mortal and immortal women.
The classical trope — of desire overcoming all obstacles, of the force of nature making culture conform to its imperatives — veers toward the practical view of life partners as caring, compassionate helpmeets rather than unreliable and flighty sources of perpetual excitement.
The classical trope of desire overcoming all obstacles, of the force of nature making culture conform to its imperatives veers toward the practical view of life partners as caring, compassionate helpmeets rather than unreliable and flighty sources of perpetual excitement.
If differences among civilizations are a perpetual source of rivalry and a potential source of wars, then a group of people whose loyalty to their own culture is attenuated is likely to be worse off relative to other groups.
