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I know, indeed, the evil of that I purpose; but my inclination gets the better of my judgment.
— Euripides · Medea

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker admits fully understanding that the course being planned is wicked, yet says desire is winning out over reasoned judgment. It is a stark confession of acting against one's better knowledge, with inclination overruling conscience even though the harm is clearly seen beforehand.
Context reviewed