A school in Chicago apparently gives students a grade of "Not Yet" rather than an F if they don't pass a class.  This makes so much sense to me.  How different it must feel to be the student who got the not yet than the one who gets an F.  Not yet instills hope and assumes future success.  F = failure, a pretty pessimistic proclamation.  I'm not motivated to try again if I label my pursuit a failure.  But "not yet", sure why not, I'd try again.

Not yet is also different than "no."  In fact, some no's mean "not yet." For example, if a stay at home mom with 3 small kids might be offered a really cool consulting job that she has to turn down.  Her no may really mean no, not yet, but maybe after the kids are older.  

Start to think of your life in terms of not yet, keeping an open mind to possibilities.