Anyone can open up to transpersonal views and Big Mind, first in glimpses and then in a more stable and deepening way. At the same time, we need to have a relatively mature and effective personality to more fully bring the view into our lives and the world.
When we develop a mature and strong ego, we learn skills neccesary to relate to inner/outer situations effectively. These skills are invaluable when we open for a more transpersonal view, and live more from this view. Without these skills, we may have a Big Mind view, but are ineffective in the world.