Fundamental ideas play the most essential role in forming a physical theory. Books on physics are full of complicated mathematical formulae. But thought and ideas, not formulae, are the beginning of every physical theory. The ideas must later take the mathematical form of a quantitative theory, to make possible the comparison with experiment.
Albert EinsteinRelated topics
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We have to prepare for what life could become in 40 years. We need to outline what is possible and what is impossible with the non-renewable resources of the Earth. What role will technological improvement play? Taking all this into account, what kind of life can we produce in the best way for 10 billion people? That's a problem that needs to be solved.
Jacques-Yves Cousteau
I watched them from the window, thy children at their play,
And I thought of all my own dear friends, who were far, oh, far away,
And childish loves, and childish cares, and a child's own buoyant gladness
Came gushing back again to me with a soft and solemn sadness;
And feelings frozen up full long, and thoughts of long ago,
Seemed to be thawing at my heart with a warm and sudden flow.
Arthur Hugh Clough
Dialectical thought understands the critical tension between "is” and "ought” first as an ontological condition, pertaining to the structure of Being itself. However, the recognition of this state of Being - its theory - intends from the beginning a concrete practice. Seen in the light of a truth which appears in them falsified or denied, the given facts themselves appear false and negative.
Herbert Marcuse
It is essential to grasp the incontestable truth that a Marxist must take cognisance of real life, of the true facts of reality, and not cling to a theory of yesterday, which, like all theories, at best only outlines the main and the general, only comes near to embracing life in all its complexity.
Vladimir Lenin
If physics leads us today to a world view which is essentially mystical, it returns, in a way, to its beginning, 2,500 years ago... This time, however, it is not only based on intuition, but also on experiments of great precision and sophistication, and on a rigorous and consistent mathematical formalism.
Fritjof Capra