"Berlin suggests that "in the case of seminal discoveries-say of imaginary numbers, or non-Euclidean geometry, or the quantum theory- it is precisely… - Howard Gardner

"Embracing a different vocabulary, Mihaly Csikszentmihalyi has described a highly sought-after affective state called the flow state or flow experience. In such intrinsically motivating experiences, which can occur in any domain of activity, people report themselves as fully engaged with and absorbed by the object of their attention. In one sense, those "in flow" are not conscious of the experience at the moment; on reflection, however, such people feel that they have been fully alive, totally realized, and involved in a "peak experience." Individuals who regularly engage in creative activities often report that they seek such states; the prospect of such "periods of flow" can be so intense that individuals will exert considerable practice and effort, and even tolerate physical or psychological pain, in pursuit thereof. Committed writers may claim that they hate the time spent chained to their desks, but the thought that they would not have the opportunity to attain occasional periods of flow while writing proves devastating."

Einstein's breakthrough was classic in that it sought to unify the elements of a physical analysis, and it placed the older examples and principles within a broader framework. But it was revolutionary in that, ever afterward, we have thought differently about space and time, matter and energy. Space and time-no more absolute-have become forms of intuition that cannot be divorced from perspective or consciousness, anymore than can the colors of the world or the length of a shadow. As the philosopher Ernst Cassirer commented, in relativity, the conception of constancy and absoluteness of the elements is abandoned to give permanence and necessity to the laws instead.

There is a limit to the development of the intellect but none of that of the heart