μυθωδῶς

From LSJ

ὃς ἂν βούληται τῆν γῆν κινῆσαι κινησάτω τὸ πρῶτον ἑαυτόν → let him that would move the world first move himself

Source

Russian (Dvoretsky)

μῡθωδῶς: мифически, на мифический лад (τοὺς παλαιοὺς ὀνομάζειν Diod.).