What we want versus what we need

A good friend and a fellow 12-step traveler sends out a daily thought which often gives me something to think about. The thought for today is:

"We frequently aren't given what we want--But we are always given exactly what we need at the moment"

I probably get more out of the thoughts that I don't readily agree with than the ones that I do, and this thought certainly fits in that category.  I have no idea why my son James needs to have cancer right now, though I am sure there are lessons for James and his extended family to learn from the experience.  The price seems excessively high.  I will have to think about this for awhile.