Serendipity and luck are by their very nature unpredictable, and therefore not part of any good plan. When something unexpected happens, things are no longer “going according to plan”, and there is a tendency to view the unexpected event either as a distraction, or as a frustrating obstacle to success.
The difference between a life full of frustrating obstacles, and a life full of serendipity, is largely a matter of interpretation.
From Serendipity finds you by Paul Buchheit