One verse

Srimad Bhagavatam 3.1.4

3.1.4

न ह्यल्पार्थोदयस्तस्य विदुरस्यामलात्मन: । तस्मिन् वरीयसि प्रश्न: साधुवादोपबृंहित: ॥ ४ ॥

na hy alparthodayas tasya vidurasyamalatmanah tasmin variyasi prasnah sadhu-vadopabrmhitah

na
never
hi
certainly
alpa-artha
small (unimportant) purpose
udayah
raised
tasya
his
vidurasya
of Vidura
amala-atmanah
of the saintly man
tasmin
in that
variyasi
highly purposeful
prasnah
question
sadhu-vada
things approved by saints and sages
upabrmhitah
full with.

Saint Vidura was a great and pure devotee of the Lord, and therefore his questions to His Grace Rsi Maitreya must have been very purposeful, on the highest level, and approved by learned circles.