To use two languages ...

To use two languages familiarly and without contaminating one by the other, is very difficult; and to use more than two is hardly to be hoped. The prizes which some have received for their multiplicity of languages may be sufficient to excite industry, but can hardly generate confidence.
To use two languages familiarly and without contaminating one by the other, is very difficult; and to use more than two is hardly to be hoped. The prizes which some have received for their multiplicity of languages may be sufficient to excite industry, but can hardly generate confidence.
 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