σταγόνες ὕδατος πέτρας κοιλαίνουσιν → 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
snail shell: V. στράβηλος, ὁ or ἡ (Sophocles, Fragment).
