Noun
nugget of truth (plural nuggets of truth)
(idiomatic) A small amount of truth in a generally untrue statement.
Sometimes humans hit on a moment of profundity more complete than their dim minds could comprehend, and they took that nugget of truth and dumped it in the refuse for the bards and the poets to find, and mangle into yodeling paeans of love. Kelley Armstrong
I always try to find the truth in a situation. That unvarnished, pure nugget of truth at the core of every issue that I write about. Michael Arrington