Truth-telling in a court of comfortable lies
Vidura was the son of Vyasa, brother to Dhritarashtra and Pandu, and widely acknowledged as the wisest man in Hastinapura.
He had no political ambitions. He had no army. What he had was the unnerving ability to see clearly and the moral courage to say what he saw.
He was ignored every single time.
He told Dhritarashtra that raising Duryodhana as the crown prince would lead to the destruction of the Kuru dynasty. He was ignored.
He pleaded against the dice game. He was overruled. He argued against the war itself, right until the armies were drawn up.
He was thanked for his counsel and dismissed.
The Mahabharata does not present Vidura's ineffectiveness as a failure of his wisdom. His advice was correct. The destruction he predicted happened exactly as he said it would.
His failure was structural. He was advising a man who lacked the courage to hear what Vidura was saying — because hearing it would have required acting against his most basic attachment: the love for his eldest son.
Vidura's response to this failure is instructive. He did not stop advising. He did not become cynical. He stayed, spoke his truth, accepted that it was not received, and chose the path of non-cooperation with injustice.
A blind king who gives his blind love to a wrongful son — what counsel can reach him? Wisdom is wasted on the heart that has already decided.
Your job is to see clearly and speak honestly. What people do with what you say belongs to them. Vidura did not fail because he was ignored. He succeeded at the only thing genuinely in his control: being a witness to truth.