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.
Lovely & too charming Fair one, notwithstanding your forbidding Squint, your greazy tresses & your swelling Back, which are more frightful than imagination can paint or pen describe, I cannot refrain from expressing my raptures, at the engaging Qualities of your Mind, which so amply atone for the Horror, with which your first appearance must ever inspire the unwary visitor.
An Irishman's imagination never lets him alone, never convinces him, never satisfies him; but it makes him that he can't face reality nor deal with it nor handle it nor conquer it: he can only sneer at them that do, and be 'agreeable to strangers', like a good-for-nothing woman on the streets.
Imagination builds the image of the self, and thought then functions within its shadows. From this self-concept grows the conflict between what is and what should be, the conflict in duality.
'Mind and matter,' said the lady in the wig, 'glide swift into the vortex if immensity. Howls the sublime, and softly sleeps the calm Ideal, in the whispering chambers of Imagination.'
...one may say anything about the history of the world - anything that might enter the most disordered imagination. The only thing one can't say is that it's rational.