SB 4.17.12

maitreya uvāca
pṛthuḥ prajānāṁ karuṇaṁ
 niśamya paridevitam
dīrghaṁ dadhyau kuruśreṣṭha
 nimittaṁ so ’nvapadyata
Synonyms: 
maitreyaḥ uvāca — the great saint Maitreya said; pṛthuḥ — King Pṛthu; prajānām — of the citizens; karuṇam — pitiable condition; niśamya — hearing; paridevitam — lamentation; dīrgham — for a long time; dadhyau — contemplated; kuru-śreṣṭha — O Vidura; nimittam — the cause; saḥ — he; anvapadyata — found out.
Translation: 
After hearing this lamentation and seeing the pitiable condition of the citizens, King Pṛthu contemplated this matter for a long time to see if he could find out the underlying causes.