Ecclesiastes 9:10-14

Whatever your hand finds to do, do it with all your might; for there is no activity, planning, knowledge, or wisdom in Sheol where you are going.

I again saw under the sun that the race is not to the swift and the battle is not to the warriors, and neither is bread to the wise nor wealth to the discerning, nor favor to the skillful; for time and chance overtake them all.

For indeed, a person does not know his time: like fish that are caught in a treacherous net and birds caught in a snare, so the sons of mankind are ensnared at an evil time when it suddenly falls on them.

This too I saw as wisdom under the sun, and it impressed me:

there was a small city with few men in it, and a great king came to it, surrounded it, and constructed large siegeworks against it.