To mix science up with ...

To mix science up with philosophy is only to produce a philosophy that has lost all its ideal value and a science that has lost all its practical value. It is for my private physician to tell me whether this or that food will kill me. It is for my private philosopher to tell me whether I ought to be killed.
To mix science up with philosophy is only to produce a philosophy that has lost all its ideal value and a science that has lost all its practical value. It is for my private physician to tell me whether this or that food will kill me. It is for my private philosopher to tell me whether I ought to be killed.
 Gilbert K. Chesterton

Quotes from the same author

Men always talk about the most important things to perfect strangers. In the perfect stranger we perceive man himself; the image of a God is not disguised by resemblances to an uncle or doubts of wisdom of a mustache.
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 Gilbert K. Chesterton
A change of opinions is almost unknown in an elderly military man.
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 Gilbert K. Chesterton
Men reform a thing by removing the reality from it, and then do not know what to do with the unreality that is left.
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 Gilbert K. Chesterton
The power which makes a man able to entertain a good impulse is the same as that which enables him to make a good gun; it is imagination.
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 Gilbert K. Chesterton
The doctrine of human equality reposes on this: that there is no man really clever who has not found that he is stupid.
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 Gilbert K. Chesterton