Identify the speaker and context of the following quotation in Homer's epic.

My mother Thetis tells me that there are two ways in which I meet my end. If I stay here and fight, I shall not return alive but my name will live for ever; whereas if I go home my name will die, but it will be long ere death shall take me. To the rest of you, then, I say, 'Go home, for you will not take Ilius.'