μὴ δὶς πρὸς τὸν αὐτὸν λίθον πταίειν → do not stumble twice on the same stone
subs.
Purifying: P. and V. καθαρμός, ὁ, λύσις, ἡ, P. κάθαρσις, ἡ. In medical sense: P. κάθαρσις, ἡ.