What are the limits to knowledge?

There are some. We will never know what happens behind the visible universe. We will never know for sure how this universe started. We will never be able to forecast the weather for more than a couple of days because of its chaotic behavior, we will never be able to predict the next pandemic for the same reason. We will never have certainty about a quantum mechanical system, we will never be able to prove that mathematics is correct (it needs some axioms), …