I am aware that the question is somewhat vague, but I am trying to locate where in Locke's writings the argument about identity – exemplified with him repairing his socks again and again – is to be found. This example (i.e. that Locke darned his socks whenever they were torn, thus raising the question of the identity of the socks) appears sometimes in philosophy books / articles on identity, but I didn't manage to find to it any mention in Locke's writings themselves. Can someone help me with that? Also, if indeed Locke did not mention it, where does the "sock"-story appear for the first time with respect to Locke? Thanks!