The phrase "a lasting idea" is correct and usable in written English.
You can use it to refer to a concept or thought that remains relevant or influential over time.
Example: "The notion of equality is a lasting idea that has shaped societies throughout history."
Alternatives: "an enduring concept" or "a timeless notion".
"Teaching children that you are a 'geek' if you wear glasses, and are of a lower self-worth than the 'rest of the gang,' although it may only seem like a t-shirt to some people it's things like this that encourage bullying, damage self-image and leave a lasting idea in a young impressionable mind.
Though you don't need to have a neat concluding sentence for this creative paragraph (unless it is part of an assignment for school), you'll need to end the paragraph in some way to remind readers of what you had described and to leave a lasting idea of the person, place, or thing in their minds.
Nurturing a new and lasting idea doesn't result from analyzing market data.
Taking into consideration the extreme circumstances under which people conserved global urbanism, it should be our duty to preserve this lasting idea in times of gentrification of cities due to global capitalism.
But the more profound, more lasting idea – being the film fans we are – was Ingmar Bergman.
I was delighted that it also created a bit of a revival on campus for Jim, his lasting ideas, and his ideals.
Yet, research has shown that students begin to develop lasting ideas of science, particularly in biology, at a young age (Kelemen 1999).
It's still, to this day, one of the most successful and lasting ideas to originate in those early days of advertising.
She reveals not only the skill involved in cutting words into stone, wood or metal to create a lasting memory, but the ideas that inform her work.
The Vice-President of the EU Commission has dismissed the idea of a lasting rift between the UK and the rest of the European Union over David Cameron's failed bid to block Jean-Claude Juncker's appointment as president.
That idea left a lasting impression on me.
