Socrates: Then we must have acquired the knowledge of equality at some previous time?
Simmias: Yes.
Socrates: That is to say, before we were born, I suppose?
Simmias: True.
Socrates: And if we acquired this knowledge before we were born, and were born having the use of it, then we also knew before we were born and at the instant of birth not only the equal or the greater or the less, but all other ideas; for we are not speaking only of equality, but of beauty, goodness, justice, holiness, and of all which we stamp with the name of essence in the dialectical process, both when we ask and when we answer questions. Of all this we may certainly affirm that we acquired the knowledge before birth?
Simmias: We may.
Socrates: But if, after having acquired, we have not forgotten what in each case we acquired, then we must always have come into life having knowledge, and shall always continue to know as long as life lasts—for knowing is the acquiring and retaining knowledge and not forgetting. Is not forgetting, Simmias, just the losing of knowledge?
Simmias: Quite true, Socrates.