Knowing what you don???t want is not the same as knowing what you want.
If you are undecided, then thinking about what you don???t want, does help. But that is still not enough, in itself, because it doesn???t help in planning and executing where you???d like to go. It is helpful if you are relying on a process of elimination to help you make decisions. But if you want to go after what is real and valuable to you, what is close to your heart, what drives meaning in your life, career or relationships, then this is simply not enough. The thing about the gap (between knowing what you want and knowing what you don???t want) is that if you leave it unaddressed, then you might end up :-
1. thinking that you???ve addressed the issue, when actually its only been done partially; or
2. losing out on the chance to be the driving force in your life and instead will leave to chance, fate or probability, what should be within your control.
While there are elements in life that are well within the purview of chance/fate, that doesn???t mean that we give up on the choices we need to make.
Be careful that you don???t mix the two up.