'Knows' in the Bible

And who knows whether he will be a wise man or a fool? Yet he will have control over all the fruit of my labor for which I have labored by acting wisely under the sun. This too is vanity.

Who knows that the breath of man ascends upward and the breath of the beast descends downward to the earth?

A poor yet wise lad is better than an old and foolish king who no longer knows how to receive instruction.

It never sees the sun and it never knows anything; it is better off than he.

For who knows what is good for a man during his lifetime, during the few years of his futile life? He will spend them like a shadow. For who can tell a man what will be after him under the sun?

Who is like the wise man and who knows the interpretation of a matter? A man’s wisdom illumines him and causes his stern face to beam.

He who keeps a royal command experiences no trouble, for a wise heart knows the proper time and procedure.

If no one knows what will happen, who can tell him when it will happen?

Yet the fool multiplies words. No man knows what will happen, and who can tell him what will come after him?