"If the sky is sentimental and old, the human path will be vicissitudes." Who wrote which poem (word)?

"If the sky is sentimental and old, the human path will be vicissitudes." Seven Laws: The People's Liberation Army Occupy Nanking by Mao Zedong.

This is a poem written by Mao Zedong at 1949 to commemorate the liberation of Nanjing and celebrate the victory of the revolution. The poet warmly praised the glorious historical facts of the PLA flying over the Yangtze River, liberating Nanjing and transforming the dark old society. And with philosophical poems, it expounds the profound military philosophy of "chasing the poor and bandits"

Original text:

Seven laws: the People's Liberation Army occupied Nanjing

Mao Zedong

Zhongshan is windy and rainy, and millions of heroes cross the river. ?

Tiger's dragon card is better than in the past, upside down and generous.

It's perfect to chase the poor bandits with the only brave ones left. Don't betray your reputation as a bully. ?

If the sky is sentimental, it will grow old, and the right way in the world is vicissitudes.

Translation:

This revolutionary storm shook Nanjing, the capital of the Chiang dynasty. The People's Liberation Army broke through the natural barrier of the Yangtze River with millions of heroes and went straight to the base area where Chiang worked hard for three and a half months. Nanjing, an ancient capital famous for its grandeur and precipitousness, has returned to the hands of the people. It is more beautiful than before. This earth-shaking change is enough to make people sing generously and rejoice. We should take advantage of this good opportunity to pursue the remnants of the enemy and liberate all of China. Don't learn from Xiang Yu, a tyrant of Chu who indulges his enemies for fame and wealth and leads to his own failure. If nature has knowledge, it will abide by the unchangeable law of ups and downs. Constant variation, development and progress are the inevitable laws of the development of human society.