The meaning of "You don't know the end of spring until it rains, but you can feel the depth of summer when it clears up" can be understood in the following two ways:
First, the development of things is a process of qualitative change caused by quantitative changes. On the surface, there are no daily changes in the continuous rain. In fact, as time goes by, in the ordinary continuous rain, there are actually subtle changes in the climate every day. When this internal change develops to a certain extent, , unknowingly discovered that a season has changed, from spring to late summer.
This meaning is often seen in our lives. For example, water drops penetrate a stone. The water droplets fall on the stone drop by drop every day. When you look at it, you can't see any change, but the water droplets keep working hard like this. This is the accumulation of quantitative changes.
After many days, or even many years, when you look at the stone on which water has dripped, you will find miracles that you cannot usually see. There will be traces of the hard work of the water droplets on the stone. Maybe it's a small pit, maybe it's a big hole. This is the qualitative change caused by "when the sky is clear, you will feel the summer is deep".
Another example is an inconspicuous sapling in the corner. When you see it accidentally, it stays weakly and quietly in the corner. It looks so small today, and it will still be so small tomorrow. You can't feel the change when you look at it every day. But it is growing secretly all the time, and it is quietly accumulating quantitative changes.
After a season, from spring to summer, you may have forgotten it. When you see it again, it has grown taller and has grown beyond the wall. It is dense. Its branches and leaves can already provide shade and shelter from the sun and rain, and its thick branches have pointed straight to the sky. This is also a qualitative change caused by "when the sun shines, you will feel the depth of summer."
Second, it tells us that the surrounding environment will affect our understanding of things. To understand things correctly, we must jump out of the current familiar environment, expand our narrow vision, and have an overall view. Avoid being obsessed with authority.
As the saying goes, the authorities are confused, but those who watch are clear. Since the poet has been in the continuous rainy season, when the poet's environment has not changed significantly, the poet has always thought that it is still a rainy spring. In fact, the spring has passed unknowingly, until the rain has passed and the sky has cleared up. The environment changed, and the poet realized that it was already the deep summer season.
This is because the poet, as an authority, was confused by the surrounding environment, leading to cognitive errors.
There is a poem that says: "If you don't know the true face of Mount Lu, you just live in this mountain." It says the same thing. When you are in Mount Lushan, you cannot see the true face of Mount Lushan, because you can only see part of the scenery of Mount Lushan, and your understanding of Mount Lushan will be biased.
If you want to know the real face of the road, you must jump out of the Lushan Mountain environment, stand in the distance or higher, and have a bird's eye view of the Lushan Mountain. Only then can you see the whole picture of the Lushan Mountain and see the Lushan Mountain clearly. Only in this way can we have a correct understanding of Lushan Mountain. Otherwise, you will make the mistake of "you don't know when the spring will come after the continuous rain".
The continuous rain does not know the end of spring, but the complete poem of summer can only be felt when the sun shines
"Xi Qing" (Southern Song Dynasty) Fan Chengda
The plum blossoms are ripe and fallen between the windows, and the walls are full of flowers. Bamboo shoots grow into forests. It rains continuously and I don’t know when spring is gone, but when it clears up, I feel that summer is deep.
Fan Chengda (1126-1193), whose courtesy name was Zhineng, was known as Shihu layman. Han nationality, from Wuxian County, Pingjiang (now Suzhou, Jiangsu Province). Poet of the Southern Song Dynasty. Posthumous title Wenmu.
Fan Chengda likes to plant plum trees in front of the window. You can taste green plums in summer and enjoy plum blossoms in winter. This poem probably means that the plums in front of the window are ripe and have dropped their stems, and the bamboo shoots under the corner have grown into a forest. It rained all day and I didn't know that spring was over. When the sky cleared, I realized that it was late summer.