Interpreting events

How often do we make plans but then something happens that prevents us from fulfilling those plans?  We then respond with, "Oh, God must not have wanted me to do that."  But in thinking so, we are not thinking clearly and the assumptions we are making are many and faulty.
To be in the midst of a situation and then comment on the unforeseen events that may have brought about that event is an extremely audacious claim.  We are so small.  Our understanding is so limited and finite.  Yet we claim to know what God is doing or not doing.
A better response would be no response at all.  Instead we should plan an event with the thought of "God willing."  We should center our thinking around the idea that just as we have a free will by which we can choose or not choose to do something, so too does God.  We ought to approach all of our actions and plans with the idea of seeing God's will.  "If God wills it, I will do such and such."  In other words, we should seek to do what would be pleasing to God.  Not what is pleasing to our selfish and short- sighted whims.
It is not the case that God will impose his desire upon us, contrary to our desires.  Wouldn't you rather form your own will to be in line with God's?