“Our evils are due mainly to the failure to apply to our international relationships knowledge which is of practically universal possession, often self-evident in the facts of daily life and experience.”

"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Context: Another evil, and one of the worst which arises from the separation of theoretical and practical knowledge, is the fact that a large number of persons, possessed of an inventive turn of mind and of considerable skill in the manual operations of practical mechanics, are destitute of that knowledge of scientific principles which is requisite to prevent their being misled by their own ingenuity. Such men too often spend their money, waste their lives, and it may be lose their reason in the vain pursuits of visionary inventions, of which a moderate amount of theoretical knowledge would be sufficient to demonstrate the fallacy; and for want of such knowledge, many a man who might have been a useful and happy member of society, becomes a being than whom it would be hard to find anything more miserable.
The number of those unhappy persons — to judge from the patent-lists, and from some of the mechanical journals — must be much greater than is generally believed.<!--p. 176

Source: Working with Emotional Intelligence (1998), p. 24

Our Mathematical Universe: My Quest for the Ultimate Nature of Reality (2014)

"On the limits of quantum theory: Contextuality and the quantum–classical cut", Annals of Physics 327 (2012) 1890–1932

The Way of God's Will Chapter 3-2 Life of Faith http://www.unification.org/ucbooks/WofGW/wogw3-02.htm Translated 1980.

...sabe más de sí misma, que es el conocimiento que hace atractivas a las personas.
Source: Todas las Almas [All Souls] (1989), p. 68

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), Human Immortality: its Positive Argument, p.298