It a sin to be lost without a purpose.
The greatest of self betrayals is perhaps this; when you have a dream, a purpose in mind but all of time and effort is lost to nothing, for your dream existed in high castles. You get someting done, as would a man feel chasing a mirage, but without a map, there is nowhere to be.
A betrayal of yourself over such trifling thing as having a plan is the greatest of sins.