World Vegan Day is celebrated on Nov 1 every year. It was first celebrated in 1994 to commemorate the 50th anniversary of the U.K. Vegan Society.

Veganism refers to refraining oneself from using anything that may have been made from animals, including meat, eggs and milk. Strict vegans also avoid products that use animal labor such as those tested on animals. They also refrain themselves from visiting zoos and aquariums or supporting activities such as animal racing or fighting.

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A visitor looks at vegan beverages displayed at a food stall during the Calais Vegan Festival organized by the French association Farplace in Calais, France, Sept. 8, 2018. PHILIPPE HUGUEN/AFP/Getty Images

Here are 10 quotes on the vegan lifestyle, courtesy The Friendly Fig, Bustle and Burger Abroad:

1.“I’m a vegan. I respect the environment and I do my best to spread the importance of such an issue.” — Jared Leto

2. “I hold that the more helpless a creature, the more entitled it is to protection by man from the cruelty of man.” — Mahatma Gandhi

3. "But for the sake of some little mouthful of flesh we deprive a soul of the sun and light, and of that proportion of life and time it had been born into the world to enjoy.” — Plutarch

4. "I decided to pick the diet that I thought would maximize my chances of long-term survival." — Al Gore

5. "It is more important to prevent animal suffering, rather than sit to contemplate the evils of the universe praying in the company of priests." — Buddha

6. "I just could not stand the idea of eating meat — I really do think that it has made me calmer. People's general awareness is getting much better, even down to buying a pint of milk: the fact that the calves are actually killed so that the milk doesn't go to them but to us cannot really be right, and if you have seen a cow in a state of extreme distress because it cannot understand why its calf isn't by, it can make you think a lot."— Kate Bush

7. "We do not need to eat animals, wear animals, or use animals for entertainment purposes, and our only defense of these uses is our pleasure, amusement, and convenience." — Gary L. Francione

8. "My perspective of veganism was most affected by learning that the veal calf is a by-product of dairying, and that in essence there is a slice of veal in every glass of what I had thought was an innocuous white liquid — milk." — Rynn Berry

9. "Until one has loved an animal, a part of one's soul remains unawakened." — Anatole France

10. "If you don’t like seeing pictures of violence towards animals being posted, you need to help stop the violence, not the pictures." — Johnny Depp