“In the same way as regards the soul, when that kind of thing in us which mirrors the images of thought and intellect is undisturbed, we see them and know them in a way parallel to sense-perception, along with the prior knowledge that it is intellect and thought that are active. But when this is broken because the harmony of the body is upset, thought and intellect operate without an image, and then intellectual activity takes place without a mind-picture.” (Plotinus, “Enneads”, cca. 270 AD)
"[...] so external sensation is the image of this perception of the soul, which is in its essence truer and is a contemplation of forms alone without being affected. From these forms, from which the soul alone receives its lordship over the living being, come reasonings, and opinions and noetic acts; and this is precisely where ‘we’ are." (Plotinus, "Enneads", cca. 270 AD)
"Constantly regard the universe as one living being, having one substance and one soul; and observe how all things have reference to one perception, the perception of this one living being; and how all things act with one movement; and how all things are the cooperating causes of all things which exist; observe too the continuous spinning of the thread and the contexture of the web." (Marcus Aurelius, "Meditations". cca. 121–180 AD)
"Oh! Son of Sari! Forms of object as perceived by our mind is no different from emptiness, (and) emptiness is no different from form. Forms perceived are virtual. Virtuality is the reality of forms perceived. Such are the processing of the stimulus of perception, the mental image of the object perceived, the mental activities of analysing this object of perception and the forming of mental conception of this object." ("Heart Sutra", cca. 7th c.) [Akishi’s translation]
"What we call the Treasury of Luminosity is the source of all Buddhas, the true nature of all beings, the Total Body of all things, the treasury of the Radiance of subtle perceptions and complete Awakening. The three bodies of the Buddhas, the four wisdoms, and the practice of each particle containing the infinite particles of Totality are all found here." (Koun Ejo, "Kōmyōzō zanmai" ["The Practice of the Treasury of Luminosity"], cca 13th century)
"All our knowledge has its origins in our perceptions." (Leonardo da Vinci, [notebooks] 1480-1519)
"To attain the Way of strategy as a warrior you must study fully other martial arts and not deviate even a little from the Way of the warrior. With your spirit settled, accumulate practice day by day, and hour by hour. Polish the twofold spirit heart and mind, and sharpen the twofold gaze perception and sight. When your spirit is not in the least clouded, when the clouds of bewilderment clear away, there is the true void." (Miyamoto Musashi, "Go Rin No Sho" ["The Book of Five Rings"], 1645)
"Once we give serious consideration to the hypothesis of the unconscious, it follows that our view of the world can be but a provisional one; for if we effect so radical an alteration in the subject of perception and cognition as this dual focus implies, the result must be a world view very different from any known before." (Carl G Jung, "The Structure and Dynamics of the Psyche", 1960)
"This is the awe-inspiring universe of magic: There are no atoms, only waves and motions all around. Here, you discard all belief in barriers to understanding. You put aside understanding itself. This universe cannot be seen, cannot be heard, cannot be detected in any way by fixed perceptions. It is the ultimate void where no preordained screens occur upon which forms may be projected. You have only one awareness here - the screen of the magi: Imagination! Here, you learn what it is to be human. You are a creator of order, of beautiful shapes and systems, an organizer of chaos." (Frank Herbert, “Heretics of Dune”, 1984)
"The third point of reference is freedom of perception; it is intent; it is spirit; the somersault of thought into the miraculous; the act of reaching beyond our boundaries and touching the inconceivable." (Carlos Castaneda, "Power of Silence", 1987)
"Any single person's viewpoint will have blind spots caused by their habitual ways of perceiving the world, their perceptual filters [...] How can we shift our perceptions to get outside our own limited world view?" (Joseph O'Connor & John Seymour, "Introducing Neuro-Linguistic Programming: Psychological Skills for Understanding and Influencing People", 1990)
"A problem is a difference between things as desired and things as perceived. […] Seen in this way, the problem could be solved either by changing desires or changing perceptions." (Donald C Gause & Gerald M Weinberg, "Are Your Lights On?", 2011)
"To strengthen the connection between your conscious mind and your subconscious mind is to gain access to a map and compass to help you move towards your dream. To gain access to the subconscious mind is to gain the ability to see and create the future, the ability to shift the present, and the ability to alter your own perceptions of the past." (Kevin Michel, "Moving Through Parallel Worlds to Achieve Your Dreams", 2013)