I've always believed that it is not the knowledge itself that drives us but the research and discovery for it.
A 'used to the bone' line: we know that we don't know.
Partecipating in a discussion or engaging in a debate is not merely to tell your peers that you are right and they are wrong, but it is about discovering how many ways a subject can be viewed, analyzed, broken into sub-subjects and then joined with other ones. And everytime this turns out to bring more available subjects to discuss and debate about.

We all have our opinions, and they are sacred. We can choose to share them, shout them, or just keep them for ourselves. We are entitled to them as they define who we are.

This all said to takle your question.

We will never know everything because there are infinite opinions about all the subjects. Some of these opinions have been debated and discussed so much we needed to create new words, others have been kept to someone's self and yet need to be scrutinized.

We, honored ones, have taken the quest to debate about everything. And if you hear someone advocating for their own rightfulness, let them shout. They are like a debate-hungry crowd cheering for their Knights.