If you pour oil and vinegar into the same vessel, you would call them not friends but opponents.
AeschylusThere are times when fear is good. It must keep its watchful place at the heart's controls.
AeschylusI pray the gods some respite from the weary task of this long year's watch that lying on the Atreidae's roof on bended arm, dog- like, I have kept, marking the conclave of all night's stars, those potentates blazing in the heavens that bring winter and summer to mortal men, the constellations, when they wane, when they rise.
Aeschylus