SB 4.31.29

vidura uvāca
so ’yam adya mahā-yogin
 bhavatā karuṇātmanā
darśitas tamasaḥ pāro
 yatrākiñcana-go hariḥ
Synonyms: 
viduraḥ uvāca — Vidura said; saḥ — that; ayam — this; adya — today; mahā-yogin — O great mystic; bhavatā — by you; karuṇa-ātmanā — most merciful; darśitaḥ — I have been shown; tamasaḥ — of the darkness; pāraḥ — the other side; yatra — where; akiñcana-gaḥ — approachable by the materially free; hariḥ — the Supreme Personality of Godhead.
Translation: 
Śrī Vidura said: O great mystic, O greatest of all devotees, by your causeless mercy I have been shown the path of liberation from this world of darkness. By following this path, a person liberated from the material world can return home, back to Godhead.
Purport: 

This material world is called tamaḥ, dark, and the spiritual world is called light. The Vedas enjoin that everyone should try to get out of the darkness and go to the kingdom of light. Information of that kingdom of light can be attained through the mercy of a self-realized soul. One also has to get rid of all material desires. As soon as one frees himself from material desires and associates with a liberated person, the path back home, back to Godhead, is clear.