It is the awareness behind all things. When you become aware that you are aware, that is the silent essence of the Infinite Being within you.
Your normal state of consciousness is in constant motion as you experience life in all its ever-changing forms. However, behind that consciousness-in-motion is the ground state of unmoving, singular awareness.
Infinite Being is that which is beyond all things. It is the state of pure beingness which is beyond all manifestation. It is the silent, unchanging consciousness which is behind all of Creation. It always existed and it always will exist complete within itself. It is infinity in every sense of the word.