νοιέω
From LSJ
τοῦ δὲ πολέμου οἱ καιροὶ οὐ μενετοί → in war, opportunities won't wait | the chances of war will not wait (Thucydides 1.142.2)
English (Strong)
from νοῦς; to exercise the mind (observe), i.e. (figuratively) to comprehend, heed: consider, perceive, think, understand.