The right path in the world is vicissitudes. What does the previous sentence mean?

All sentient beings will grow old and wither. The right path in the world is vicissitudes. The previous sentence is that if there is love in the sky, it will be old. It's a sentence from the Tang Dynasty poet Li He's Song of the Golden Copper Immortal Han Dynasty. Song of Cold Poems by Golden Copper Immortals is a poem written by the poet Li He on his way from Chang 'an, the capital, to Luoyang, after he resigned due to illness.

Jin Ping Mei Han Ge is one of Li He's representative works. The whole poem is unique in conception, profound and touching, with vivid and changeable images and strange and appropriate words. Poetry expresses the poet's sense of rise and fall, the pain of home and country, and the sadness of life experience. Among them, the sentence "If the sky is affectionate, the sky will be old" has become a famous sentence that has been passed down through the ages. It was quoted in his poem "Seven Laws: The People's Liberation Army Occupy Nanjing".