Theory
An ounce of action is worth a ton of theory. ~Friedrich Engels


The whole of science is nothing more than a refinement of everyday thinking. ~Albert Einstein


Science has to be understood in its broadest sense, as a method for comprehending all observable reality, and not merely as an instrument for acquiring specialized knowledge. ~Alexis Carrel


Furious activity is no substitute for understanding. ~H. H. Williams


The wise see knowledge and action as one. ~Bhagavad-Gita


Philosophy is the science which considers truth. ~Aristotle


The most beautiful thing we can experience is the mysterious. It is the source of all true art and all science. He to whom this emotion is a stranger, who can no longer pause to wonder and stand rapt in awe, is as good as dead: his eyes are closed. ~Albert Einstein


Ideology is a form of illiteracy. Those addicted to it are unable to understand anything other than what fits their pattern. ~John Saul


Relativity keeps anything from happening at once. Quantum mechanics keeps everything from really happening at all. ~Lou A. Riley


The goal of ultimate understanding keeps receding ever the more one understands the inadequacy of one's understandings. ~James Ogilvy


In theory, there is no difference
between theory and practice.
But, in practice, there is. ~Jan van de Snepscheut


The point of philosophy is to start with something so simple as not to seem worth stating, and to end with something so paradoxical that no one will believe it. ~Bertrand Russell


Through our assumptions and choice of method we largely create the world we later discover. ~David L. Cooperrider


Experience is the child of Thought,
and Thought is the child of Action. ~Benjamin Disraeli


New frameworks are like climbing a mountain: the larger view encompasses, rather than rejects, the earlier view. ~Albert Einstein


There is nothing so practical
as a good theory. ~Kurt Lewin

(a constructivist corollary)

There is nothing so practical
as good practice of theory. ~Yogesh Malhotra


What is difficult to solve with one paradigm may be easy to solve with another. ~Joel Barker


words are shoelaces
string them right
and they allow you to move
else they can trip you up

words are sandpipers
dashing in and out
avoiding waves of bad sentiment
plucking at the leavings

words are streetlights
strung along the way
revealing hidden danger
attracting moths and lovers ~Ping Liu


Theories are useful rather that true. Theories must, of course, be congruent with human experience, but they are not literally factual. Rather they are models — ways of making sense of our experience and communicating about it. And as our understanding evolves, so inevitably must our theories. ~William Houff


Our theories determine what we measure. ~Albert Einstein


Simplicity is the most difficult thing to secure in this world; it is the last limit of experience and the last effort of genius. ~George Sand