The phrase "a timeless truth" is correct and usable in written English.
It can be used to refer to a principle or idea that remains valid and relevant across different times and cultures.
Example: "The saying that honesty is the best policy is a timeless truth that resonates with people of all ages."
Alternatives: "an eternal truth" or "a universal truth."
His example renews a timeless truth about creativity: the royal road to the heights leads down.
But did the Babylonians conceive of it as a "theorem" — a timeless truth subject to proof based on accepted principles?
"Jefferson understood a timeless truth," Meacham writes, "that politics is kaleidoscopic, constantly shifting, and the morning's foe may well be the afternoon's friend".
In a weekend interview, he cast it firmly in the past tense by describing it as a mere "Ashdownite thesis" rather than a timeless truth.
That's a timeless truth, of course, but there's a strong case to be made that these days it's worse than ever: thanks to Facebook and other social networking sites – and the frictionless ease of electronic communication in general – it's far easier to maintain weak quasi-friendships, and thus to hear the burnished versions of far more lives.
But there's an important point to be made here, a timeless truth, which is that however much vocals can be manipulated, or fixed, or homogenised, finding your own voice – your unique, personal sound – is still the key ingredient in becoming a singer.
I think that Vermeer's ideal was a classless, timeless truth that is returning to the fore in contemporary culture: the essential role that aesthetic pleasure must play in any seriously lived life.
The song's bittersweet melody revealed a larger, timeless truth.
Strauss historicizes philosophy in order to make an argument for timeless truth.
"If you're passionate about America and about God's Word, if you long to see our nation return to the timeless truth of a Biblical worldview, if you're willing to be on the frontlines and speak out to mobilize others to act -- if you have as little as one hour a week to volunteer -- become a Champion!", Champions for Life spells out to its website visitors.
They argued that the former, because it's invented, is bogus and worthless; I countered that there's a difference between plain fact and timeless truth.
