Vanity is so frequently the ...

Vanity is so frequently the apparent motive of advice that we, for the most part, summon our powers to oppose it without very accurate inquiry whether it is right. It is sufficient that another is growing great in his own eyes at our expense, and assumes authority over us without our permission; for many would contentedly suffer the consequences of their own mistakes, rather than the insolence of him who triumphs as their deliverer.
Vanity is so frequently the apparent motive of advice that we, for the most part, summon our powers to oppose it without very accurate inquiry whether it is right. It is sufficient that another is growing great in his own eyes at our expense, and assumes authority over us without our permission; for many would contentedly suffer the consequences of their own mistakes, rather than the insolence of him who triumphs as their deliverer.

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.
To keep your secret is wisdom; but to expect others to keep it is folly.
Love is the wisdom of the fool and the folly of the wise.
Memory is the mother of all wisdom.
Friendship, like love, is destroyed by long absence, though it may be increased by short intermissions.