Shiva Purana
अंते च सुखदः प्रोक्तो दयालुत्वान्न संशयः ॥ यथा चैव सुवर्णं च शोधि तं शुद्धतां व्रजेत् ॥ ४१ ॥
Since he is compassionate he is said to be the bestower of happiness ultimately. A gold piece can become pure only when it is put into the fire and purified.
english translation
aMte ca sukhadaH prokto dayAlutvAnna saMzayaH ॥ yathA caiva suvarNaM ca zodhi taM zuddhatAM vrajet ॥ 41 ॥
hk transliteration by Sanscript