This injunction can be given by parents who are vulnerable and want to be the special ones.  Or the jealous parent who feels unaccomplished by their own internal negative messages about themselves. Or a poverty stricken family who fear success and education because that means their kids may leave the fold.  Or education meaning moving on and therefore making the children work rather then go to college.  Or school not being a priority in ones growing up years.  The experience of not delighting in ones children can dampen any excelling in life.  To omit the parental pleasure in seeing our children evolve and be themselves can convey that its not okay to succeed.  If we don’t believe in our children and celebrate their growth it may be difficult for them to “Go for It” whatever that may be in adulthood.  With this individuals can even sabotage success by behaviours and internal beliefs that they are not even aware of.  I worked with a  writer and journalist who sabotaged the writing of her novel in many  ways that caused distress and confusion. One of the ways was deleting a chapters off the computer and another way was not saving the writings.  These are things that sound related to dis-organisation.  However, this never happened in relation to any other work she did.  Know this and exploring it allowed her to cross transact this process leaving open the door to reach ones full potential and become accomplished.  I firmly believe that all human beings have a right to this.  Another theme i have often found is students that try really hard but come exams they are likely to panic, go blank, forget or walk out.  The same can apply to people whose work and being seen is dependent on presentation.  The nerves experienced are often not congruent to the situation.  I see the “Kings Speech” film are relevant to this in some way, as the speech impediment when centre stage was so traumatic it hindered delivery.  The therapist engaged in the Kings free child energy and work with his fears in the relationship thus building, trust and understanding of what stood in the way of this person performing.  Therefore developing strategies that balanced out all the nerves and associated messages that may have lay beneath the surface. I have even seen people come down with psychogenic illness at times which are crucial to them making it.