The surface of the mind, sometimes calm and still like a stagnant pool; sometimes brushed by a gentle breeze, creating ripples; sometimes hit by raging waves, as if there were monsters lurking... The human heart is truly difficult to fathom, even oneself cannot see oneself clearly.
Every time I go out and take a ride, I always like to sit by the window because it allows me to easily observe the ever-changing scenery outside the window. As the picturesque scenery passes by, my mood changes accordingly, and my thoughts leap in my mind, constantly shifting from one place to another... In fact, at this moment, what I am seeing is not the scenery, but my own inner self. I feel that compared to the external world, the most incomprehensible thing is one's own mind. No matter how complex and ever-changing the world is, there are always patterns and rules that can be followed, and to some extent, it can be predicted. But the mind, it is unpredictable. Because many times, you cannot know what it will think of in the next moment.
Even if you know everything about a person's past actions, thoughts, and future plans, you still cannot completely see through them. You still cannot fully predict their thoughts and actions in the next moment - or their reactions to events happening in the current environment. There may be certain patterns and rules in this (such as MBTI personality analysis), but not everything. Apart from the predictable part, the rest is determined by inscrutability.