search and you will find
शैले शैले न माणिक्यं मौक्तिकं न गजे गजे।
साधवो न हि सर्वत्र चन्दनं न वने वने।।
shailey shailey na maanickyam maukthikam na gajey gajey
saadhavo na hi sarvatra chandanam na vaney vaney
manikyam (ruby stone) is not found in all mountains, pearls are not stored in the forehead of all elphants, sandalwood does not grow in all forests and likewise good people cannot be found in abundance everywhere.
(it is found that certain great mountain ranges contain very precious stones among their rocky innards--the mastaka of great elephants contain shining white pearls as in the case of Kuvalayaapeeda the huge elephant which was prodded by Kamsa to kill Krishna but the latter easily pulled out the elephant's tusk to kill it and in this process the pearls stored in the mastaka started flowing down..even though the earth is covered by large areas of forests the sandalwood grows only in selected areas and likewise the presence of really good people also..they are found very rarely)