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- All I will say is that untiring vigilance and mind-searching must be devoted to the subject, because the enemy is crafty and cunning and full of novel treacheries and stratagems.
- Untiring vigilance and untiring searching of the mind is being, and must be, devoted to the subject, because, remember, the enemy is crafty and there is no dirty trick he will not do.
- Therefore, in casting up this dread balance sheet and contemplating our dangers with a disillusioned eye, I see great reason for intense vigilance and exertion, but none whatever for panic or despair.
There are no more uses of "vigilant" in Their Finest Hour.
Typical Usage (best examples)