Only when people's hearts are antagonistic can they be unpredictable.
The heart is unpredictable, and the sea is unpredictable.
People's hearts are different, such as faces.
The pain of many things is unpredictable.
It's hard to go, not in the mountains and rivers, but only between human feelings.
People are unpredictable, and the world is like frost.
The abyss has a bottom, and people are unpredictable.
The world is cold only because people are unpredictable!