I wonder if I've been changed in the night? Let me think. Was I the same when I got up this morning? I almost think I can remember feeling a little different. But if I'm not the same, the next question is 'Who in the world am I?' Ah, that's the great puzzle!
Have i gone mad? Im afraid so, but let me tell you something, the best people usualy are.
Why, sometimes I've believed as many as six impossible things before breakfast.
I'm afraid I can't explain myself, sir. Because I am not myself, you see?
My dear, here we must run as fast as we can, just to stay in place. And if you wish to go anywhere you must run twice as fast as that.
Lewis Carroll Alice in Wonderland
Be what you would seem to be - or, if you'd like it put more simply - never imagine yourself not to be otherwise than what it might appear to others that what you were or might have been was not otherwise than what you had been would have appeared to them to be otherwise.