We need a theory of personal identity. Ask yourself a question. Are you the same person today as you were say ten years ago?
Physically, of course, you’re different. All the cells that made up your body ten years ago, except brain cells, have died and been replaced. You also look different.
Mentally you’ve also changed. You probably believe many things today that you didn’t 10 years ago. Today you have various memories, opinions, feelings, emotions, desires, goals, projects, fears, that you didn’t have ten years ago. We’re all constantly changing – physically, psychologically, and emotionally. So, how can we be the same person from one time to the next?
Some say we can’t. Probably the first to say this was Heraclitus, an ancient Greek philosopher. He said a lot of things, most of them incomprehensible, but his most famous proclamation was “You can’t step into the same river twice.” Insane, but mostly harmless. No, what he meant was the water molecules that made up the river a month ago are completely different from the ones that make it up today. So that makes it a different river. Is he right?
How can we be said to have a personal identity if we are constantly changing? And what doesn’t change about us that we can identify as “us?”
Physically, of course, you’re different. All the cells that made up your body ten years ago, except brain cells, have died and been replaced. You also look different.
Mentally you’ve also changed. You probably believe many things today that you didn’t 10 years ago. Today you have various memories, opinions, feelings, emotions, desires, goals, projects, fears, that you didn’t have ten years ago. We’re all constantly changing – physically, psychologically, and emotionally. So, how can we be the same person from one time to the next?
Some say we can’t. Probably the first to say this was Heraclitus, an ancient Greek philosopher. He said a lot of things, most of them incomprehensible, but his most famous proclamation was “You can’t step into the same river twice.” Insane, but mostly harmless. No, what he meant was the water molecules that made up the river a month ago are completely different from the ones that make it up today. So that makes it a different river. Is he right?
How can we be said to have a personal identity if we are constantly changing? And what doesn’t change about us that we can identify as “us?”