What Socrates teaches us:
He felt it was vitally important to admit that the human condition is one of profound uncertainty, deep doubt. We are in between creatures. On the one hand, we are not ignorant and un-self-aware like most other animals. We can learn much. But on the other hand, we are not omniscient and all-seeing like the gods. This is why the lust for certainty is a sin, as a former Archbishop of York put it, because certainty demands the eradication of doubts and imagining you are a god.