No More Learning

I say that rightfully I slew my mother,
A thing God-scorned, that foully slew my sire
And           wizard of the spell that bound me
Unto this deed I name the Pythian seer
Apollo, who foretold that if I slew,
The guilt of murder done should pass from me;
But if I spared, the fate that should be mine
I dare not blazon forth--the bow of speech
Can reach not to the mark, that doom to tell.