《宋书·志·卷二十》
变化间多态多姿，向后退好像水势阻遏，向前进就有如腾飞。
变多姿，退若激，进若飞。
The changes are various and beautiful, retreating as if stopped by water, advancing as if flying.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 变多姿，退若激，进若飞。 [/INST] The changes are various and beautiful, retreating as if stopped by water, advancing as if flying.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 变多姿，退若激，进若飞。
user
The changes are various and beautiful, retreating as if stopped by water, advancing as if flying.
assistant