Any plans for the weekend? I bet something unexpected or unplanned will happen anyway.
How many times have you managed to accomplish something in each and every detail as planned?
There is so many things we do not control. In fact, much more then these which we do.
There are people who do not like changes in plans at all and woe to these who cause such situations. There is no point in loosing your energy and nerves ti fight unpredictability and randomness. Me, I like changes, but only for the better.
I am not saying that it is impossible to achieve the goal – especially in a long term. If you know what you want, you will achieve it one way or the other. If plan A won’t work, you still have more than twenty letters in the alphabet.