I would advise you, Sir, to ...

I would advise you, Sir, to study algebra, if you are not an adept already in it: your head would get less muddy, and you will leave off tormenting your neighbours about paper and packthread, while we all live together in a world that is bursting with sin and sorrow.
I would advise you, Sir, to study algebra, if you are not an adept already in it: your head would get less muddy, and you will leave off tormenting your neighbours about paper and packthread, while we all live together in a world that is bursting with sin and sorrow.
 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