Major: Psychology

"'Who are YOU?' said the Caterpillar. Alice replied rather shyly, 'I harldy know, sir, just at present--at least I know who I WAS when I got up this morning, but I think I must have changed several times since then.'

'What do you mean by that?' said the Caterpillar sternly. 'Explain yourself!'

'I can't explain myself, I'm afraid, sir,' said Alice, 'because I'm not myself you see...'"

--Lewis Carroll