πέτρην κοιλαίνει ρανὶς ὕδατος ἐνδελεχείῃ → constant dropping wears away a stone, constant dripping will wear away the hardest stone, little strokes fell big oaks, constant dripping wears the stone, constant dropping wears the stone, constant dripping will wear away a stone
subs.
See metal. Silver ore: P. ἀργυρῖτις, ἡ (Xen.), or use V. ὑπάργυρος πέτρα, ἡ (Eur., Cycl. 294).
