Nakhasikhasuttaṃ

I wrote a post with a basis on Nakhasikasutta

A Fingernail
At Sāvatthī.
Then the Buddha, picking up a little bit of dirt under his fingernail, addressed the mendicants: “What do you think, mendicants? Which is more: the little bit of dirt under my fingernail, or this great earth?”

“Sir, the great earth is far more. The little bit of dirt under your fingernail is tiny. Compared to the great earth, it doesn’t count, there’s no comparison, it’s not worth a fraction.”

“In the same way the sentient beings reborn as humans are few, while those not reborn as humans are many.

So you should train like this: ‘We will stay diligent.’ That’s how you should train.”
SN 20.2

I have also added a quote from the Dog Duty Ascetic as well to show that if you act like animals, you will end up like animals. The same can be said about the Buddha speaking to the Ox ascetic

"Well, Punna, since I certainly cannot persuade you when I say ‘Enough, Punna, let that be. Do not ask me that,’ I shall therefore answer you.

  1. “Here, Punna, someone develops the dog duty fully and unstintingly, he develops the dog-habit fully and unstintingly, he develops the dog mind fully and unstintingly, he develops dog behavior fully and unstintingly. Having done that, on the dissolution of the body, after death, he reappears in the company of dogs. But if his view is such as this: ‘By this virtue or duty or asceticism or religious life I shall become a (great) god or some (lesser) god,’ that is wrong view in his case. Now there are two destinations for one with wrong view, I say: hell or the animal womb. So, Punna, if his dog duty is perfected, it will lead him to the company of dogs; if it is not, it will lead him to hell.”
    KUKKURAVATIKA SUTTA: THE DOG-DUTY ASCETICMN 57
    Kukkuravatika Sutta: The Dog-duty Ascetic