'Possible' in the Bible

Truly, I see that it is so: and how is it possible for a man to get his right before God?

If only a clean thing might come out of an unclean! But it is not possible.

Is it possible for a man to be of profit to God? No, for a man's wisdom is only of profit to himself.

Is it possible for his armies to be numbered? and on whom is not his light shining?

How then is it possible for man to be upright before God? or how may he be clean who is a son of woman?

Is it possible for Leviathan to be pulled out with a fish-hook, or for a hook to be put through the bone of his mouth?