“It is sometimes difficult to get rid of first impressions.”
Withnell v. Gartham (1795), 6 T. R. 396.
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Lloyd Kenyon, 1st Baron Kenyon 92
British Baron 1732–1802Related quotes

“First get rid of the delusion “I am the body,” then only will we want real knowledge.”
Pearls of Wisdom

“You never get a second chance to make a good first impression.”
Misattributed

Brian Mulroney, PC Leadership Convention, May 30, 2003
“Yes, first impressions do count but every single impression counts.”
You cannot fake being positive, but you can practise and teach yourself to appear and act in a positive manner.
Source: Your Job-Hunt Ltd – Advice from an Award-Winning Asian Headhunter (2003), p.18

Source: The Witch of Portobello (2007), p. 152.
Context: You are what you believe yourself to be.
Don't be like those people who believe in "positive thinking" and tell themselves that they're loved and strong and capable. You don't need to do that because you know it already. And when you doubt it — which happens, I think, quite often at this stage of evolution — do as I suggested. Instead of trying to prove that you're better than you think, just laugh. Laugh at your worries and insecurities. View your anxieties with humor. It will be difficult at first, but you'll gradually get used to it. Now go back and meet all those people who think you know everything. Convince yourself that they're right, because we all know everything, it's merely a question of believing.
Believe.