"Je vis pour cela ce n'est pas juste un passe-temps"
— Drake
Simplified Meaning:
When someone says "I live for this, it isn't just a hobby," they mean that what they are doing is extremely important to them. It's not just something they do for fun sometimes, but it's a big part of their life. For example, think about a professional athlete. They don't just play basketball or soccer occasionally; they train every day, follow strict diets, and make many sacrifices to be the best. This passion drives their daily routine and choices. Similarly, someone saying this might be talking about their job, a creative pursuit, or a cause they care deeply about. They put in a lot of effort and dedication because it truly matters to them. If you feel this way about something, it means you are very committed and it brings you a lot of fulfillment.