A quotation from Euripides:
«««««
Oh child, words well spoken might be false,
and with the beauty of words, might conquer truth;
yet this is not the surest test, that is character
and right; he who conquers with his fluency,
he is clever, but I hold facts mightier than words, always.
[ὦ παῖ, γένοιντ᾽ἂν εὖ λελεγµέν…
»»»»»
Full quote, sourcing, notes:
https://wist.info/euripides/57659/