Acharya Prashant explains that the primary way to distinguish between truth and falsehood is to observe whether a company or situation brings one closer to the truth or forces one to hide. He outlines three main paths for seekers: self-inquiry through the soul, learning from scriptures, and seeking guidance from a living Guru. While the soul is the highest guide, only a rare few are close enough to it to rely solely on internal guidance. Most people require scriptures or a living teacher to point out their errors, as the ego often misinterprets internal thoughts as spiritual truth.