"私の人生で唯一のものは音楽で、私は決してリラックスできません。"

Simplified Meaning:

This quote means that music is the most important thing in the person's life, and it takes up all their time and energy. They are so dedicated to music that they never get a chance to take a break or rest. Imagine a student who studies so hard for exams that they never hang out with friends or watch movies. Their entire life revolves around their studies, and they feel like they can never stop studying. For a musician, practicing and making music might be so consuming that they have no time for hobbies or relaxation. Following this advice, one learns the importance of balance in life. While it’s good to be passionate about something, it’s also essential to take time to relax and enjoy other parts of life.