The Tibetan Book of the Dead
Book II: The Fourth Method of Closing the Womb-Door
Again, even if that doth not close the womb, and one findenth [oneself] ready to enter the womb, then by means of the teaching [called] 'The Untrue and the Illusory' the womb should be closed. That is to be meditated as follows: 'O, the pair, the father and the mother, the black rain, the storm-blasts, the clashing sounds, the terrifying apparitions, and all the phenomena, are, in their true nature, illusions. Howsoever they may appear, no truth is there [in them]; all substances are unreal and false. Like dreams and like apparitions are they; they are non-permanent; they have no fixity. What advantage is there in being attached [to them]! What advantage is there in having fear and terror of them! It is the seeing of the non-existent as the existent. All these are hallucinations of one's own mind. The illusory mind itself doth not exist from eternity; therefore where should these external [phenomena] exist?
'I, by not having understood these [things] in that way hitherto, have held the non-existent to be the existent, the unreal to be the real, the illusory to be the actual, and have wandered in the Sangsara so long. And even now if I do not recognize them to be illusions, then, wandering in the Sangsara for long ages, [I shall be] certain to fall into the morass of various miseries.
'Indeed, all these are like dreams, like hallucinations, like echoes, like the cities of the Odour-eaters, like mirage, like mirrored forms, like phantasmagoria, like the moon seen in water — not real even for a moment. In truth, they are unreal; they are false.'