“Multiplicity is only apparent, in truth, there is only one mind…”
"The Oneness of Mind", as translated in Quantum Questions: Mystical Writings of the World's Great Physicists (1984) edited by Ken Wilber
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Erwin Schrödinger 67
Austrian physicist 1887–1961Related quotes

“Live according to the one and only truth and surrender to the trend of truth.”
Flow of Divine Guidance (vol.1)

Vol. VI, p 5, "First Talk in Rajahmundry (20 November 1949) http://www.jkrishnamurti.com/krishnamurti-teachings/view-text.php?tid=335&chid=4655&w=%22You+cannot+find+truth+through+anybody+else%22, J.Krishnamurti Online, JKO Serial No. 491120
Posthumous publications, The Collected Works
Context: You cannot find truth through anybody else. How can you? Surely, truth is not something static; it has no fixed abode; it is not an end, a goal. On the contrary, it is living, dynamic, alert, alive. How can it be an end? If truth is a fixed point, it is no longer truth; it is then a mere opinion. Sir, truth is the unknown, and a mind that is seeking truth will never find it. For mind is made up of the known; it is the result of the past, the outcome of time — which you can observe for yourself. Mind is the instrument of the known; hence it cannot find the unknown; it can only move from the known to the known. When the mind seeks truth, the truth it has read about in books, that "truth" is self-projected, for then the mind is merely in pursuit of the known, a more satisfactory known than the previous one. When the mind seeks truth, it is seeking its own self-projection, not truth. After all, an ideal is self-projected; it is fictitious, unreal. What is real is what is, not the opposite. But a mind that is seeking reality, seeking God, is seeking the known. When you think of God, your God is the projection of your own thought, the result of social influences. You can think only of the known; you cannot think of the unknown, you cannot concentrate on truth. The moment you think of the unknown, it is merely the self-projected known. So, God or truth cannot be thought about. If you think about it, it is not truth. Truth cannot be sought; it comes to you. You can go after only what is known. When the mind is not tortured by the known, by the effects of the known, then only can truth reveal itself. Truth is in every leaf, every tear; it is to be known from moment to moment. No one can lead you to truth; and if anyone leads you, it can only be to the known.

“Truth is one; only It is called by different names.”
Source: The Gospel of Sri Ramakrishna (1942), p. 423
Context: Truth is one; only It is called by different names. All people are seeking the same Truth; the variance is due to climate, temperament, and name. A lake has many ghats. From one ghat the Hindus take water in jars and call it "jal". From another ghat the Mussalmāns take water in leather bags and call it "pāni". From a third the Christians take the same thing and call it "water". Suppose someone says that the thing is not "jal" but "pāni", or that it is not "pāni" but "water", or that it is not "water" but "jal", It would indeed be ridiculous. But this very thing is at the root of the friction among sects, their misunderstandings and quarrels. This is why people injure and kill one another, and shed blood, in the name of religion. But this is not good. Everyone is going toward God. They will all realize Him if they have sincerity and longing of heart.

“Your version of the truth is the only one that matters.”
"Truth is singular. Its 'versions' are mistruths."
"An Orison of Sonmi~451", p. 199 (Nook Edition)
Cloud Atlas (2004)