do one a bad turn
From LSJ
ὃς ἂν βούληται τῆν γῆν κινῆσαι κινησάτω τὸ πρῶτον ἑαυτόν → let him that would move the world first move himself
English > Greek (Woodhouse Extra)
κακῶς ποιεῖ, κακῶς ποιεῖν, κακῶς δρᾶν
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