“There's one uneasy borderline between what is external and what is internal, and this borderline is defined exactly by the sense organs and the skin and the introduction of external things within my own body. Consciousness is altered by physical events and physical objects, which impinge upon my sense organs, or which I introduce into my body.
Now the name traditionally given to external objects or processes which change you internally is sacrament. Sacraments are the visible and tangible techniques for bringing you close to your own divinity.”

“All existing things upon this earth, which have knowledge of their own existence, possess, some in one degree and some in another, the power of thought, accompanied by perception, which is the awakening of thought by the effects of external objects upon the senses.”

“My countersuggestion, issuing essentially from Carnap's doctrine of the physical world in the Aufbau, is that our statements about the external world face the tribunal of sense experience not individually but only as a corporate body.”

“As coordination contains all the principles of organization, it likewise expresses all the purposes of organization, in so far as these purposes relate to its internal structure. To avoid confusion we must keep in mind that there are always two objectives of organization, the internal and the external. The latter may be anything, according to the purpose or interest that calls the group together, but the internal objective is coordinative always.”

“Organization structure must perform the major functions of facilitating the collection of information from external areas as well as permitting effective processing of information within and between subunits which make up the organization.”

“The genetic expression within any given cell at any given time is not “fixed,” as many people think it is. It is not a static thing. Rather, it is continually adapting to both external and internal stimuli – meaning that it adjusts to the environment and to any changes in the surroundings, as well as to any changes within the body itself.”

“Our initial sensory data are always "first derivatives," statements about differences which exist among external objects or statements about changes which occur either in them or in our relationship to them. Objects and circumstances which remain absolutely constant relative to the observer, unchanged either by his own movement or by external events, are in general difficult and perhaps always impossible to perceive. What we perceive easily is difference and change — and difference is a relationship.”

“The voice is on the borderline between the physical and the spiritual.”

“According to the technical language of old writers, a thing and its qualities are described as subject and attributes; and thus a man’s faculties and acts are attributes of which he is the subject. The mind is the subject in which ideas inhere. Moreover, the man’s faculties and acts are employed upon external objects; and from objects all his sensations arise. Hence the part of a man’s knowledge which belongs to his own mind, is subjective: that which flows in upon him from the world external to him, is objective.”

“The practice of yogasana for the sake of health, to keep fit, or to maintain flexibility is the external practice of yoga. … While this is a legitimate place to begin, it is not the end ... Even in simple asanas, one is experiencing the three levels of quest: the external quest, which brings firmness of the body; the internal quest, which brings steadiness of intelligence; and the innermost quest, which brings benevolence of spirit.”