how do we know

How can we know what the future has in store for us?
What belongs to you today might belong to me tomorrow, and vice versa. How do we secure the things that truly belong to us? Your value is inflated, overvalued. But then again how are we to know my valuation is correct? 
All i want is stability, contradictory to general consensus of change. 
Yes i want change, i approve change, but can't we have a certain degree of certainty. heisenberg's uncertainty principle and shrodinger's cat serve to show that we live in complex worlds where our future, and even the present, are manipulated, controlled, and changing even as we speak. Somewhere out there, lives change. Mine's about to.