"自我不是现成的，而是在通过选择行动中不断形成的。"

Simplified Meaning:

We become the person we are not by being born a certain way but by the choices we make and the things we do every day. Think of it like making a sculpture from clay. The clay at the start is just a lump, but as the artist works on it, shapes it, and refines it, it becomes a beautiful statue. Similarly, our actions and decisions shape who we become over time. For example, if someone wants to be a kind person, they might choose to help others, say kind words, and show compassion. Each of these small actions builds up and forms their character. It’s not that they were born kind; they became kind through their choices. In the same way, someone who wants to be successful in their career might work hard, learn new skills, and stay dedicated. Their commitment and actions slowly lead them to success. It's a reminder that we have control over who we become through our choices and actions. So, if you want to be a certain kind of person, start by doing the things that person would do.