Aeschylus,
Aeschylus' Prometheus Bound and the Seven Against Thebes
“ Know thyself, and assume to thyself new manners; for among the gods too there is a new monarch. But if thou wilt utter words thus harsh and whetted, Jupiter mayhap, though seated far aloft, will hear thee, so that the present bitterness of sufferings will seem to thee to be child's play. But, O hapless one! dismiss the passion which thou feelest, and search for a deliverance from these sufferings of thine. Old-fashioned maxims these, it may be, I appear to thee to utter; yet such becomes the wages of the tongue that talks too proudly. But not even yet art thou humble, nor submittest to ills ”
