What's the role of "conceit" in the Dhamma?

I read the following on the internet: > Some rules assume the conceit, "I am". Importantly, Buddhist rules do > not. For example, take the first three rules of MN8: > > MN8:12.2: ‘Others will be cruel, but here we will not be cruel.’ > > MN8:12.3: ‘Others will kill living creatures, but here we will not > kill living creatures.’ > >MN8:12.4: ‘Others will steal, but here we will > not steal.’ What exactly is conceit? Does the above quote include conceit? If so, why? If not, why not?