What does the allusion in Buddhist scriptures mean that "a person is as rare as a blind turtle in the sea"?

The allusion of "a person is as rare as a blind turtle in the sea" in Buddhist scriptures says that life is as rare as a blind turtle floating on a log, and it doesn't know how many cycles it will take to repair it, so we should cherish, protect and make good use of it.

The Buddha once asked Ananda, "If the whole earth becomes an ocean and there is a blind turtle, its life span is infinite. It only sticks its head out once every 100 years. " . There is a driftwood in the sea, and there is a hole in it. This piece of wood floats around with the waves. This blind turtle only sticks its head out once every 100 years. Can it just touch the hole in the driftwood? "

Ananda said to the Buddha, "This is very difficult! Why? Because the blind turtle may swim to the east of the sea, this driftwood may drift westward with the wind, and then drift around east, west, north and south, which may not be met. " The Buddha said, "It's just such a situation that it's so difficult! However, our goal of acquiring the human body is to surpass the encounter between blind turtles and driftwood! "

Extended data:

Ordinary people are blinded by greed, anger, ignorance, slowness, doubt and Jaken, just like a blind turtle wandering in love and wanting the sea. I don't know that I can have a human body, which is a once-in-a-lifetime fate, not to mention meeting the knowledge of Buddhism and great goodness, which is even more rare than a once-in-a-century blind turtle emerging from the sea and being embedded in a driftwood hole.

Therefore, if you can get a personal life and hear Buddhism in this life, you must cherish this rare karma and strive for an early liberation in order to live up to this life.

References:

Baidu encyclopedia-blind turtle floating wood