My feeling in this poem is that the poet is conveying his perceptual knowledge of relativity, such as big and small, long and short, seemingly big things (such as the world), but sometimes they can be accommodated in small things (across the sand). This kind of understanding can be positive, and there is a pleasure of discovering true knowledge, such as the translation of quotations on the first floor; It can also be pessimistic and have a sense of impermanence, as in the translation of LZ quotations.
If you don't study poetry, then you only need to interpret the feelings of poetry. Poetry brings you "artistic conception" rather than "meaning" As long as you feel the feelings that the poet wants to convey, you will understand and feel the artistic charm of poetry.
No one knew william blake when he was alive, and he was not discovered until the early 20th century. These lines are not so famous in Europe and America, and when talking about Blake, they are not his masterpieces. It seems that only people in China are crazy about these words. I guess it's because this poem has something in common with Buddhist thought.
These four lines are selected from a long poem 132, which is called "the omen of innocence" and is the first four lines.
See a world in a grain of sand.
There is a heaven in a wild flower.
Hold infinity in the palm of your hand.
Eternity will melt in an hour.
I estimate that there are at least twenty or thirty Chinese versions of these four lines. Choose some from below.
See the world from a grain of sand,
See heaven in a flower.
Hold infinity in the palm of your hand,
For a moment, accept eternity.
-the translator is unknown
To see a world in a grain of sand,
See a sky in a flower,
Hold infinity in the palm of your hand,
Hold infinity in an hour.
-"Black's Poetry" Shanghai Sanlian, translated by Zhang Chiheng.
See the world from a grain of sand,
To see heaven in a flower,
Turn eternity into an hour,
Hold infinity in your hand.
Wang Zuoliang
A flower and a world,
One sand a day,
Your palm is infinite,
Instances contain eternal robbery.
-Zong Baihua
See a world in a grain of sand.
A paradise in a wild flower
Hold infinity in the palm of your hand.
Eternity is collected in an instant.
-"The most beautiful English in the world-Life Story"
The style of this long poem is consistent with the first four lines. They are all aphorisms with philosophy, which are generally difficult to understand. I read it several times, but I didn't understand it.
Check out the links in Resources. The following information is very good, inspiring and philosophical.