Because the main idea of Buddhism is "unspeakable" and precisely because of "unspeakable", "others can't see through" refers to an ideological realm that others can't reach, a spiritual understanding that others can't reach.
Original poem:
Peach blossom temple song
Bohu, Tang Ming
Taohuawu Taohua Temple, Taohuaguan Taohuaxian.
Peach Fairy cultivates peach trees, picks them and drinks them.
When you wake up, you just sit in front of the flowers, and when you are drunk, you come to sleep under the flowers.
Half drunk and half awake day after day, flowers bloom year after year.
I hope I die of old age. I don't want to bow my head in front of horses and chariots.
If you are rich, you will become a hermit.
If the revealer is compared to a hermit, one is underground and the other is in heaven.
If we compare Hua San to chariots and horses, I will have no leisure.
The world laughs at me for being crazy, and I laugh at others for not being able to see through it.
There are no five tombs, six heroes tombs, no flowers, no wine, no hoes to plow the fields.
Translation:
There are Taohuawu Taohuaan and Taohuawu Taohuaxian.
The Peach Fairy planted many peach trees, and he picked them for wine.
Sit quietly in the flowers when you wake up, and sleep under the flowers when you are drunk.
Half awake and half drunk, day after day, year after year.
I just want to die of old age in the peach blossom wine room, and I don't want to bow before the horses and chariots of dignitaries.
Flow is the interest of nobles, and wine glasses and flowers are the fate and hobbies of poor people like me.
If you compare the wealth of others with my poverty, one is in the sky and the other is in the ground.
If I compare my poverty to the horses and chariots of the powerful, they work for the powerful, but I get the pleasure of leisure.
Others laugh that I am crazy, but I laugh that others can't see through the world.
You haven't seen those rich families once brilliant, but now you can't see their graves, just for farmland.
Extended data
Poets pretend to be peach blossom immortals, and refer to two completely different lifestyles as "drinking from old age" and "bowing before riding a horse" respectively, and form a sharp contrast between wealth and poverty, showing their true hearts in ordinary reality with vulgar negative aspects and cynical spirit.
The whole poem is as clear as words, without any allusions and flowery rhetoric. The tone of language is close to vulgarity, lightness and self-contained, but it contains infinite artistic tension and gives people continuity.
References:
Baidu Encyclopedia-Peach Blossom Temple Song