In doubt...

If we will be able to foresee the future then we will never be in doubt. 

If we will never be in doubt then we will be certain in every decision.

If we will be certain in every decision then things will be easier.

If things will be easier then the world will never be like today's.

If the world will never be like today's then what were we?

I do agreed we, human beings are always live in doubt.
Even the word 'If' had proven we are living in doubt.
Living in doubt can be torturing sometimes.
So rather than to seek for the future, embrace the present will be more practical.