A Persian cat is pictured during a world cats show contest organized by the World Cat Federation in Istanbul, Oct. 16, 2016. Getty Images

Tuesday is International Cat Day — marked across the globe on Aug. 8 to celebrate cats, the world's favorite pet. The day was first marked by IFAW, the International Fund for Animal Welfare, in 2002.

Some countries celebrate World Cat Day on Feb. 17, while the United States dedicates Oct. 29 as National Cat Day.

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Here are some quotes about felines, collected from Goodreads and BrainyQuote.

1. “What greater gift than the love of a cat?” — Charles Dickens

2. “Time spent with a cat is never wasted.” — Colette

3. “A cat has absolute emotional honesty: human beings, for one reason or another, may hide their feelings, but a cat does not.” — Ernest Hemingway

4. "Cats do care. For example, they know instinctively what time we have to be at work in the morning and they wake us up twenty minutes before the alarm goes off." — Michael Nelson

5. "You cannot look at a sleeping cat and feel tense." — Jane Pauley

6. "In ancient times cats were worshipped as gods; they have not forgotten this." — Terry Pratchett

7. “Cats know how to obtain food without labor, shelter without confinement, and love without penalties.” — Walter Lionel George

8. “How we behave toward cats here below determines our status in heaven.” — Robert A. Heinlein

9. "Cats have it all — admiration, an endless sleep and company only when they want it." — Rod McKuen

10. "If we treated everyone we meet with the same affection we bestow upon our favorite cat, they, too, would purr." — Martin Buxbaum

Cat 1
The sunglasses cat poses during the Los Angeles Feline Film Festival at the Memorial Coliseum on Sept. 21, 2014. Getty Images

11. "Cats tell me without effort all that there is to know." — Charles Bukowski

12. “A cat can be trusted to purr when she is pleased, which is more than can be said for human beings.” — William Ralph Inge

13. “Cats do not have to be shown how to have a good time, for they are unfailing ingenious in that respect.” — James Mason

14. “I wish I could write as mysterious as a cat.” — Edgar Allan Poe

15. "I have studied many philosophers and many cats. The wisdom of cats is infinitely superior." — Hippolyte Taine

16. “I love cats because I enjoy my home; and little by little, they become its visible soul.” — Jean Cocteau

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17. "I love them, they are so nice and selfish. Dogs are too good and unselfish. They make me feel uncomfortable. But cats are gloriously human." — L.M. Montgomery

18. "Cats never listen. They’re dependable that way; when Rome burned, the emperor’s cats still expected to be fed on time." — Seanan McGuire

19. "My relationships with my cats has saved me from a deadly, pervasive ignorance." — William S. Burroughs

20. "Cats are anthropomorphized in art because they are so laid back that you automatically attribute human thoughts and feelings to them." — Jim Davis

Several Twitter users shared photos of their cats to mark the day.