Who is John Locke from Writings, 1902-1910 and what is their importance?

Locke engages in a treatment of the personality or our 'Spiritual substance.' He states that consciousness consists of the fact that at any time of our existence we remember other parts of our existence and experience them as being part of the same whole. He then goes on to question whether, if we remove that ability, would it impact us in any meaningful way. He suggests that 'personal identity' lives in 'pragmatically defined parameters.'