If a man proves too clearly and convincingly to himself...that a tiger is an optical illusion--well, he will find out he is wrong. The tiger will himself intervene in the discussion, in a manner which will be in every sense conclusive.
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.
When forced to work within a strict framework, the imagination is taxed to its utmost and will produce its richest ideas. Given total freedom, the work is likely to sprawl.
I have observed dreams and visions very carefully, and am now certain that the imagination has some way of lighting on the truth that the reason has not, and that its commandments, delivered when the body is still and the reason silent, are the most binding we can ever know.
'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.'
The chief imagination of Christendom,
Dante Alighieri, so utterly found himself
That he has made that hollow face of his
More plain to the mind's eye than any face
But that of Christ.