What is authenticity?
There are 2 types of authenticity, that of the ego and that of Being.
The ego is the state of being trapped by matter, by duality, by the in thoughts expressed will of feelings. Accordingly, its identity consists of the bonding to forms like dogmas being truths that govern your being and doing. Truths of the institutions church, state and science were the highest truth and thus applied as dogmas. In this time dogmas lose their authority. If this loss is complete the ego is authentic. Due to the fact that the ego is trapped by matter, by duality, by part it is separated from the singularity, the Whole, and therefore not perfectly authentic.
Being is the state of being free/loose of matter, duality, part, the in thoughts expressed will of feelings, the ego-will. Therefore it is the state that is one with the continuously changing Whole, life itself, and the Will thereof that cannot be known. This means that Being is the perfect authenticity that cannot be known.