doors of perception

Those who have gotten their doors of perception open wide enough often enough know that this statement of Blake's is not mere poetic exaggeration.

1958, Robert K. Greenleaf, Servant Leadership

“The doors of perception have opened all at once! We must close them!” “Hey, there's quadrillions of them!” “Maybe millions!” “What are you -- Quadrillions is a larger number.” “Quadrillions is a fake number.” “No, it's not! It's a thousand billion.” “Really? Look, are you just trying to make me look like a douche in front of the new guy?”

2010 October 17, Doc Hammer, “Assisted Suicide” (10:51 from the start), in The Venture Bros., season 4, episode 14, spoken by Dr. Byron Orpheus (Steven Rattazzi)

Helplessly hoping to open doors of perception To the mysteries and the quandaries of mankind; The secrets of the universe are all we wish to find.

2015, William Austin Moore, The Keys to the Doors of Perception

In my opinion, Myron's epilepsy is of a particular sort, something known as SLPE [schizophrenia-like psychosis of epilepsy], a form of spilepsy in which the Pleroma is only a stone's throw away and the doors of perception are wide open.

2016, Anthony Peake, Opening The Doors of Perception: The Key to Cosmic Awareness, page 83

He could not take seriously these chaps in ties and suits or tweeds who wore brogues and cardigans when at home all day, who belonged to the Garrick and the Athenaeum, who lived in solid north London villas or Costwold mansions, who spoke loftily, as one might after a lifetime pontificating from All Souls, Oxford; who had never risked a peep round the doors of perception by taking a drug other than tobacco or alcohol, which they peevishly refused to accept were psychoactive addictive sustances;

2022, Ian McEwan, Lessons, page 509