I am not able to instruct ...

I am not able to instruct you. I can only tell that I have chosen wrong. I have passed my time in study without experience; in the attainment of sciences which can, for the most part, be but remotely useful to mankind. I have purchased knowledge at the expense of all the common comforts of life: I have missed the endearing elegance of female friendship, and the happy commerce of domestic tenderness.
I am not able to instruct you. I can only tell that I have chosen wrong. I have passed my time in study without experience; in the attainment of sciences which can, for the most part, be but remotely useful to mankind. I have purchased knowledge at the expense of all the common comforts of life: I have missed the endearing elegance of female friendship, and the happy commerce of domestic tenderness.
 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