'This promise constitutes the heart of my Christian beliefs and my call to natural-scientific research: we will attain to knowledge of the universe through the spirit of truth, and thereby to understanding of our being one with the deepest, most comprehensive reality, God.' 
Source: LSD : My Problem Child (1980), Ch. 11 : LSD Experience and Reality
                                    
“And I will ask the Father and he will give you another helper to be with you forever, 17 the spirit of the truth, which the world cannot receive, because it neither sees it nor knows it. You know it, because it remains with you and is in you.”
             John 14:16-17 http://wol.jw.org/en/wol/b/r1/lp-e/nwt/E/2013/43/14#h=102:55-102:305, New World Translation of the Holy Scriptures 
Gospel of John
        
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John the Evangelist 23
author of the Gospel of John; traditionally identified with… 10–98Related quotes
                                        
                                        <p>No te conoce el toro ni la higuera,
ni caballos ni hormigas de tu casa.
No te conoce el niño ni la tarde
porque te has muerto para siempre.</p><p>No te conoce el lomo de la piedra,
ni el raso negro donde te destrozas.
No te conoce tu recuerdo mudo
porque te has muerto para siempre.</p><p>El otoño vendrá con caracolas,
uva de niebla y montes agrupados,
pero nadie querrá mirar tus ojos
porque te has muerto para siempre.</p><p>Porque te has muerto para siempre,
como todos los muertos de la Tierra,
como todos los muertos que se olvidan
en un montón de perros apagados.</p><p>No te conoce nadie. No. Pero yo te canto.
Yo canto para luego tu perfil y tu gracia.
La madurez insigne de tu conocimiento.
Tu apetencia de muerte y el gusto de su boca.
La tristeza que tuvo tu valiente alegría.</p> 
Llanto por Ignacio Sanchez Mejias (1935)
                                    
                                        
                                        God is Dead, Now Zen is the Only Living Truth (1989)  YouTube video of the lecture http://www.youtube.com/watch?v=PBEIeRSLb8k 
Context: It was good of Friedrich Nietzsche to declare God dead — I declare that he has never been born. It is a created fiction, an invention, not a discovery. Do you understand the difference between invention and discovery? A discovery is about truth, an invention is manufactured by you. It is man-manufactured fiction. Certainly it has given consolation, but consolation is not the right thing! Consolation is opium. It keeps you unaware of the reality, and life is flowing past you so quickly — seventy years will be gone soon. Anybody who gives you a belief system is your enemy, because the belief system becomes the barrier for your eyes, you cannot see the truth. The very desire to find the truth disappears. But in the beginning it is bitter if all your belief systems are taken away from you. The fear and anxiety which you have been suppressing for millennia, which is there, very alive, will surface immediately. No God can destroy it, only the search for truth and the experience of truth — not a belief — is capable of healing all your wounds, of making you a whole being. And the whole person is the holy person to me.
                                    
                                        
                                        As quoted in Divine Harmony: The Life and Teachings of Pythagoras by John Strohmeier and Peter Westbrook. (1999) 
The Golden Verses
                                    
                                        
                                        23 October 1929, From a letter to a Muslim disciple 
India's Rebirth 
Context: You say that you ask only for the Truth and yet you speak like a narrow and ignorant fanatic who refuses to believe in anything but the religion in which he was born. All fanaticism is false, because it is a contradiction of the very nature of God and of Truth. Truth cannot be shut up in a single book, Bible or Veda or Koran, or in a single religion. The Divine Being is eternal and universal and infinite and cannot be the sole property of the Mussulmans or of the Semitic religions only, — those that happened to be in a line from the Bible and to have Jewish or Arabian prophets for their founders. Hindus and Confucians and Taoists and all others have as much right to enter into relation with God and find the Truth in their own way. All religions have some truth in them, but none has the whole truth; all are created in time and finally decline and perish. Mahomed himself never pretended that the Koran was the last message of God and there would be no other. God and Truth outlast these religions and manifest themselves anew in whatever way or form the Divine Wisdom chooses. You cannot shut up God in the limitations of your own narrow brain or dictate to the Divine Power and Consciousness how or where or through whom it shall manifest; you cannot put up your puny barriers against the divine Omnipotence. These again are simple truths which are now being recognised all over the world; only the childish in mind or those who vegetate in some formula of the past deny them. You have insisted on my writing and asked for the Truth and I have answered. But if you want to be a Mussulman, no one prevents you. If the Truth I bring is too great for you to understand or to bear, you are free to go and live in a half-truth or in your own ignorance. I am not here to convert anyone; I do not preach to the world to come to me and I call no one. I am here to establish the divine life and the divine consciousness in those who of themselves feel the call to come to me and cleave to it and in no others.
                                    
As quoted in Words of Wisdom : More Good Advice (1990) by William Safire and Leonard Safire, p. 185