Śrī Caitanya Caritamrta · Text Madhya 6.279
লোহাকে যাবৎ স্পর্শি’ হেম নাহি করে ।
তাবৎ স্পর্শমণি কেহ চিনিতে না পারে ॥ ২৭৯ ॥
lohāke yāvat sparśi’ hema nāhi kare
tāvat sparśa-maṇi keha cinite nā pāre
As long as it does not turn iron into gold by its touch, no one can recognize an unknown stone to be a touchstone.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.