In order to get a better grip on this, it's necessary to have a more precise grasp of key terms. Up to this point, we have been using the terms "anxiety" and "fear" more or less interchangeably, but at this juncture, it's important to refine our understanding. Fear is always of something definite, of some danger which requires our attention. Fear is the natural and often useful response which we experience in the face of some external threat. It is that which triggers our primal "fight or flight" response.
Anxiety, however, is a truly existential emotion and in order to better understand it, it is perhaps helpful to turn to the existential philosophers who made a point of studying anxiety in all its forms and all its manifestations. Kierkegaard defines anxiety as the "dizziness of freedom" and describes it as the underlying, all pervasive, universal condition of human existence. Anxiety is then, not fear of any one thing, but of the very condition of being conscious and of having to make choices in a world which does not make its meaning or goals transparent to us and which frequently enough seems inimicable to human aspirations and to human existence. It is this more fundamental emotion which most directly characterizes the core emotional state of type Six, not any of the more immediate fears, which often enough are simply place holders in the consciousness of the type Six personality. It is as though the Six feels their anxiety bubbling up to the center of consciousness and then scans the environment for something external to fear; this feared, but potentially manageable thing, can then occupy the Six's attention and avert it from that nameless horror that they sense might exist at the very heart of human existence.
According to A. H. Almaas, the type Six personality most directly experiences and suffers from a loss of "basic trust" in the goodness of the universe. This loss of basic trust is the very condition of fallen existence, and thus attaches to all of the fixations, but Sixes experience it at the very core of their consciousness. And it is this most basic and fundamental emotion which must be dealt with directly and defeated if the Six is to achieve true liberation. It is, like the journeys of all the enneatypes, a true "hero's journey."
Many Sixes succumb to their anxieties and fears. Some of these settle for a simulacra of true courage and attempt to find peace of mind by convincing themselves of the truth of some contrived system of belief. To this end they might surround themselves by a chorus of voices from like-minded others, while projecting their own unacknowledged shadow onto those with whom they disagree. Then there are those Sixes who choose to over identify with the role of "rebel" and adopt a defiant and oppositional stand against whatever exists, which often enough succeeds in sowing little more than negativity.