It is certain that success ...

It is certain that success naturally confirms in us a favourable opinion of our own abilities. Scarce any man is willing to allot to accident, friendship, and a thousand causes, which concur in every event without human contrivance or interposition, the part which they may justly claim in his advancement. We rate ourselves by our fortune rather than our virtues, and exorbitant claims are quickly produced by imaginary merit.
It is certain that success naturally confirms in us a favourable opinion of our own abilities. Scarce any man is willing to allot to accident, friendship, and a thousand causes, which concur in every event without human contrivance or interposition, the part which they may justly claim in his advancement. We rate ourselves by our fortune rather than our virtues, and exorbitant claims are quickly produced by imaginary merit.

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.