A Quote by Charles Kettering

Modern psychology teaches that experience is not merely the best teacher, but the only possible teacher.. There is no war between theory and practice. The most valuable experience demands both, and the theory should supplement the practice and not precede it.
There is a distinction, but no opposition, between theory and practice. Each to a certain extent supposes the other. Theory is dependent on practice; practice must have preceded theory.
I believe without exception that theory follows practice. Whenever there is a conflict between theory and practice, theory is wrong. As far as I'm concerned, we make theories for what people have done.
Theory without practice is of little value, whereas practice is the proof of theory.Theory is the knowledge, practice the ability.
Critical reflection on practice is a requirement of the relationship between theory and practice. Otherwise theory becomes simply "blah, blah, blah, " and practice, pure activism.
Experience by itself teaches nothing... Without theory, experience has no meaning. Without theory, one has no questions to ask. Hence, without theory, there is no learning.
The difference between theory and practice is larger in practice than the difference between theory and practice in theory.
We see many persons talking the most wonderfully fine things about charity and about equality and the rights of other people and all that, but it is only in theory. I was so fortunate as to find one who was able to carry theory into practice. He had the most wonderful faculty of carrying everything into practice which he thought was right.
In theory, practice should work like theory. In practice, it doesn't.
If we have a correct theory but merely prate about it, pigeonhole it and do not put it into practice, then that theory, however good, is of no significance.
I have a theory that there is something abnormal about children who like to practice instruments They are either geniuses or, more often, completely untalented. I certainly did not like to practice, and the teacher who hit me, and the view of the park, did not help to improve my attitude.
In theory there is no difference between theory and practice. In practice there is.
In theory, there is no difference between theory and practice. But, in practice, there is.
Experience is our only teacher both in war and peace.
Some claim evolution is just a theory. As if it were merely an opinion. The theory of evolution, like the theory of gravity, is a scientific fact. Evolution really happened. Accepting our kinship with all life on Earth is not only solid science. In my view, it’s also a soaring spiritual experience.
In sum: banking theory and practice, as immobilizing and fixating forces, fail to acknowledge men and women as historical beings; problem-posing theory and practice take the people's historicity as their starting point.
Most of all I like "bad" lines, that is those considered bad, in my opinion unjustly, by theory. The reason for the last quotation marks is that most so-called theory is only a collection of examples from master practice.
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