reasons...for what reasons?

how painful it is sometimes to find out reasons for things...and what for...to be forgotten the next day. the thing i am quoting below was something i got from some movie, but was apt to my mindset then,
"..there was a man who built a railway track. for some reasons he built the tracks in a straight line, without any curves in it. i dont know for what reasons he built it so. reasons are easily forgotten..".