τοῦ δὲ πολέμου οἱ καιροὶ οὐ μενετοί → in war, opportunities won't wait | the chances of war will not wait (Thucydides 1.142.2)
calmly: P. and V. ἡσυχῆ, ἡσύχως, Ar. and V. ἀτρέμα, Ar. and P. ἀτρέμας, ἠρέμα.
