Havamal

Then ‘tis made manifest, if of runes thou questionest him, those to the high ones known, which the great powers invented, and the great talker painted, that he had best hold silence.

Þat er þá reynt er þú at rúnum spyrr inum reginkunnum þeim er gerðu ginnregin ok fáði fimbulþulr þá hefir hann bazt ef hann þegir

Havamal: 80, Gestaþáttr