One account of knowledge is that knowledge is justified through belief. That is, we have a belief of something and we have justification of it. And as long as that belief is true, then that counts as knowledge. One question here is, what are the necessary and sufficient conditions for knowledge? Is that right? Do we have to have justification for knowledge? Or are there some things that justify themselves and aren't justified in terms of other things? So I'm asking you, what is knowledge?