life an Uncertain Expression

Is there anything certain in life? To me life is a uncertain story ,which can have any outcome you have no prior clue , life to me fallows the law of quantum physics; it does some times turn they way you have expected it to , but other times the outcome is totally unexpected. So do we really control our destines or we just made to believe that we can shape our destines - You worked hard for particular examination but the day you sit for exam you got hit by car and broke your leg and instead of finding your self in some big office after getting through the exam you find you self in hospital bed for a year, and next time you had to appear for exam you again got hit by a car and this time you got your eye wounded and eventually lost your eye site .so, the outcome that has to be your success in exam , is now you being a handicap for your rest of life .

Now question is , if every outcome in life is uncertain then what is in our hands; to work for desired outcome without caring for uncertainty . And if we just stop working because we are not sure about outcome, world will come to a standstill. so, the best policy is to work for particular outcome without any attachment for that outcome -working without attachment for desired outcome, is working for outcome without getting affected by final result whether it be desired or not.

But , even if we can motivate ourselves to work for desired outcome without any attachment for outcome you are not sure whether the motivation will remain intact or whether we can remain focused for working towards any result . This part of uncertainty is quite mysterious in nature; although it is supposed that if you can control you thought process and reactions to external stimulus you can remain focused and be able to work efficiently for any task you have undertaken. But how easy or difficult it is to control thought process is difficult question to answer.
it seems that motivation to remain focused for performing some task and desired outcome of task both are uncertain in nature where the uncertainty attached with later is obvious , but that attached with formal is either not recognized or not properly documented .I feel the inception of desire and motivation to work for full-filling that desire and
fulfillment of desire all are governed by divine design and thus except few rare choices in deciding the final outcome everything is uncertain. i have experienced the times when for no logical reason i lost my motivation to work for a desired result and times when so de-motivated to work for a result ,an unexpected surge of motivation to work for that task.

in conclusion ,we are driven by some divine design which has partially decided an outcome for our task and final outcome is decided after some parameters are received from our side ,rest hard work focus and honesty are just signs for particular outcome which are seen in doer of task when a particular outcome can be expected but not with full certainty; is that we are chosen for getting tasks done and in process we burden ourselves with success or failure of task.