There is no "True" knowledge until you have the pure, uncontaminated knowledge of the Self. Before that there is only symbolic knowledge, third hand knowledge learned from textbooks, or second hand knowledge learned from one’s own experience.
But knowing the Self is entirely different; it is the pure knowing of the sage where you realize the identity of Self and Knowledge.
This is not a state of realization that can be gained through awakening of the Kundalini or Tantra. It is not obtained through the Not-Knowing of Zen, or the emptiness of Buddhism.
It is 100% opposite to neo-Advaita.
It is an entirely different path.
In this path one just listens to the truth of Self, both of the Manifest Self, which is mostly ignored by Buddhism and neo-Advaita and is the sense of the divine awareness/consciousness within, and of the Unmanifest Self--the Witness prior to Consciousness.
Then you let the truth sink in over time and begin a long period of self-inquiry with observation and with feeling within for the sensation of I-Am, of I-exist!
Then, one day, for whatever reason or whatever trigger, you experience the Manifest Self of God embodied in you, which leads inevitably to the realization of the Noumenal Self that witnesses all this: that one who lies prior to Consciousness.
Once you have tasted this true knowledge of Self, the discovery of your identity with God as embodied Self, and the world, and the Witness, everything changes.
Confusion vanishes; certainty takes its place; every moment you know who and where you are. God is in you and you are in God. Emptiness is in you, and you are in emptiness. Bliss is within you, and you are within bliss. You become as solid as Mt. Everest. Unmovable even while moving.