Either we are aware we don’t know the truth as Einstein himself said, he knows he doesn’t know God’s truth. (which was his entire quest in science “I want to discover God’s mind, the rest are just details”)

Or we know – which means, our ego has permeated our consciousness; for it is impossible for any human – Einstein being the greatest example – to discover it.

Or it was taught to us, namely the wisdom of truth, Kabbalah / Chassidus, itself which is infinite.