Whatever your hand finds to do, do it with all your might, for in the grave, where you are going, there is neither working nor planning nor knowledge nor wisdom. I have seen something else under the sun: The race is not to the swift or the battle to the strong, nor does food come to the wise or wealth to the brilliant or favor to the learned; but time and chance happen to them all. Moreover, no man knows when his hour will come: As fish are caught in a cruel net, or birds are taken in a snare, so men are trapped by evil times that fall unexpectedly upon them.

I also saw under the sun this example of wisdom that greatly impressed me: There was once a small city with only a few people in it. And a powerful king came against it, surrounded it and built huge siege works against it. Now there lived in that city a man poor but wise, and he saved the city by his wisdom. But nobody remembered that poor man.

Ecclesiastes 9:9-15