SB 3.1.10

yadopahūto bhavanaṁ praviṣṭo
 mantrāya pṛṣṭaḥ kila pūrvajena
athāha tan mantra-dṛśāṁ varīyān
 yan mantriṇo vaidurikaṁ vadanti
Word for word: 
yadā — when; upahūtaḥ — was called by; bhavanam — the palace; praviṣṭaḥ — entered; mantrāya — for consultation; pṛṣṭaḥ — asked by; kila — of course; pūrvajena — by the elder brother; atha — thus; āha — said; tat — that; mantra — advice; dṛśām — just suitable; varīyān — excellent; yat — that which; mantriṇaḥ — the ministers of state, or expert politicians; vaidurikam — instructions by Vidura; vadanti — do they say.
Translation: 
When Vidura was invited by his elder brother [Dhṛtarāṣṭra] for consultation, he entered the house and gave instructions which were exactly to the point. His advice is well known, and instructions by Vidura are approved by expert ministers of state.
Purport: 

Political suggestions by Vidura are known as expert, just as, in modern times, Paṇḍita Cāṇakya is considered the authority in good counsel in both political and moral instructions.