What is the meaning of the sentence "Shui Han water heating fish know, spring flowers bloom and fall"?

Nature has its own laws of change, and people or things deep in nature are familiar with its changes.

1, extended meaning:

The "water" here can be extended to the environment on which people or things depend. "Cold and warm" can be extended to the degree of concern of the boss who grasps the fate of people or things. ?

On the surface, "flowers bloom and flowers fall" means the cycle of seasons, but in fact it means the impermanence of life, and nature is ruthless. Only by conforming to the laws of nature can people be comfortable.

2. This sentence comes from augmented sages.

3. "Augmented Xianwen". Formerly known as "Xianwen", it is called "Xianwen" in ancient and modern times, which is a bibliography of Taoist children's enlightenment compiled by China in the Ming Dynasty. The title of the book was first seen in the drama Peony Pavilion in the Wanli period of the Ming Dynasty, so it can be inferred that this book was written at the latest in the Wanli period.

China's proverbs and aphorisms from ancient times to the present are collected in A Tribute to Glory. Later, it was changed to this appearance after the continuous supplement of literati in Ming and Qing Dynasties. It was called "Ceng Guang's contribution" in history, commonly known as "Ceng Guang's contribution".

I have never seen any books, only the revised edition of Confucian scholar Zhou during Tongzhi period in Qing Dynasty, which may be the crystallization of folk creation.

4. On the surface, it seems to be disorganized to enlarge the literary works, but as long as you read this book carefully, it is not difficult to find its internal logic. This book's understanding of human nature is based on the premise of "inherent evil", and it is polluted by money with a cold-eyed insight into social life and family ties. "The poor live in downtown areas and no one asks, but the rich have distant relatives in the mountains"; Friendship is just a lie. "There are many brothers with wine and flesh, and you have never seen anyone in an emergency"; Honor is determined by money, "don't believe it, but look at the wine on the banquet and respect the rich first"; Law and justice are manipulated by money. "The yamen is open in eight characters, and you can't get in without money"; Human nature is distorted by interests, "there are straight trees in the mountains, but there are no straight people in the world"; Sophistication leads people to guess. "It is difficult to draw a tiger but not a bone, and people know the face but don't know the heart"; Good and evil are inseparable. "Going into the mountains is not afraid of hurting tigers, but human feelings are a double-edged sword." Augmented summarizes the dark phenomena in many aspects of society and presents them to readers coldly. The vast majority of sentences in augmented works come from classics and history, poems and songs, plays and novels, and the subsets of literati's miscellaneous notes. Their thoughts and concepts are directly or indirectly derived from various classics of Confucianism, Buddhism and Taoism. Broadly speaking, it is a popular version of "classic" rewarded by exquisite customs. You can read it without explanation, or you can broaden your understanding of the thoughts and wisdom of life through reading.