I'm looking for an ancient quote that resembles something like, "Now that the gods are involved, fate is sealed / all hope is lost / it's useless to fight our fate" vel sim.
Essentially, I'm looking for some recognition that the gods have changed the nature of whatever activity was going on, and that now the rest of that activity is set to follow the will of the gods.
This path doesn't have to be limited to fate; it could also be a recognition that the gods are too powerful to fight against.
For a sample scenario of where this could be used, imagine the warriors on the battlefield leading a charge, then once the gods are involved, they realize their hopes are dashed. They now know they are going to lose, that all hope is lost.
Of course, the scenario doesn't need to be pessimistic, just fatalistic. The important aspect is that there's a recognition that something has changed with the plan, either because the gods are now involved, or else that the gods have made the fate known.
It's as if, halfway through dying by Oedipus' hand, Laius realizes what the gods have done and just goes through with it. Or if Croesus upon realizing what the Oracle meant gives up fighting against Cyrus' army. I don't think we see these two things happened, but one could expect a quote there recognizing the futility of human action once the gods' actions are made known.
Is there a quote you like in an ancient text that says something like that? It doesn't have to be limited to Classical works, though those are preferred.