'Uncertain' in the Bible

Why has my pain been perpetualAnd my wound incurable, refusing to be healed?Will you indeed be to me like a deceptive brookWith water that is unreliable?

whether Paul or Apollos or Cephas (Peter) or the world or life or death or things present or things to come; all things are yours,

For if someone sees you, a person having knowledge, eating in an idol’s temple, then if he is weak, will he not be encouraged to eat things sacrificed to idols [and violate his own convictions]?

And if the [war] bugle produces an indistinct sound, who will prepare himself for battle?

As for the rich in this present world, instruct them not to be conceited and arrogant, nor to set their hope on the uncertainty of riches, but on God, who richly and ceaselessly provides us with everything for our enjoyment.

being a double-minded man, unstable and restless in all his ways [in everything he thinks, feels, or decides].