It is impossible to convey an idea of the torrential character of the identification of opposites as it streams through the mind in this experience. I have sheet after sheet of phrases dictated or written during the intoxication, which to the sober reader seem meaningless drivel, but which at the moment of transcribing were fused in the fire of infinite rationality. God and devil, good and evil, life and death, I and thou, sober and drunk, matter and form, black and white, quantity and quality, shiver of ecstasy and shudder of horror, vomiting and swallowing, inspiration and expiration, fate and reason, great and small, extent and intent, joke and earnest, tragic and comic, and fifty other contrasts figure in these pages in the same monotonous way. The mind saw how each term belonged to its contrast through a knife-edge moment of transition which it effected, and which, perennial and eternal, was the nunc stans of life. The thought of mutual implication of the parts in the bare form of a judgment of opposition, as "nothing-but," "no more-than," "only-if," and so on, produced a perfect delirium of theoretic rapture. And at last, when definite ideas to work on came slowly, the mind went through the mere form of recognizing sameness in identity by contrasting the same word with itself, differently emphasized, or shorn of its initial letter.

William James: "The Subjective Effects of Nitrous Oxide," Mind, Vol. 7, 1982