The mathematicians are well ...

The mathematicians are well acquainted with the difference between pure science, which has only to do with ideas, and the application of its laws to the use of life, in which they are constrained to submit to the imperfections of matter and the influence of accidents.
The mathematicians are well acquainted with the difference between pure science, which has only to do with ideas, and the application of its laws to the use of life, in which they are constrained to submit to the imperfections of matter and the influence of accidents.
 Samuel Johnson

Quotes from the same author

If a man does not make new acquaintances as he advances through life, he will soon find himself left alone. A man, sir, should keep his friendship in a constant repair.
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 Samuel Johnson
To keep your secret is wisdom; but to expect others to keep it is folly.
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 Samuel Johnson
Love is the wisdom of the fool and the folly of the wise.
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 Samuel Johnson
Memory is the mother of all wisdom.
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 Samuel Johnson
Friendship, like love, is destroyed by long absence, though it may be increased by short intermissions.
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 Samuel Johnson