Everything we do, be it big or small, should lead us towards our overall goals in life.
In the game of chess, there is one major rule you have to follow: do everything for a reason. Every move of a chess piece has to result in an advantage to your cause, even if not directly; but to move a piece without any reason in particular would be suicidal, and you would be nothing but a wood-pusher.
The same goes with the things we do in life. Always ask yourself, “How is this going to help me in my overall goals? Does this fit in with my plan for life?”