# Why does the proposer sends an accept request with the same value it got from the acceptor?

In the second phase of the paxos algorithm, the proposer issues an accept request with the number n and the value v it got from the acceptor, if the acceptor has already chosen a value previously. My questions is why the proposer is doing this? Because once a value if chosen it is permanent and cannot be changed, so in this case the proposer is just learning the chosen value, which was sent in the response of the prepare request. Why would it asks to accept a value already accepted?