"一夜にして成功することはほとんど伝説です"

Simplified Meaning:

Achieving success quickly, without much effort or time invested, is rare. Most people who seem to become successful suddenly have actually been working hard for a long time. For example, think about a famous singer. They may appear to become a star overnight, but in reality, they probably spent years practicing and performing in small venues before getting noticed. A good way to understand this is to look at how plants grow. You might see a flower bloom and think it happened overnight, but it actually took a lot of time, sunlight, and water for that flower to grow. This shows us that behind every major success, there is usually a long period of hard work and persistence. For your own life, this means that you shouldn't expect to succeed immediately at something new. Keep putting in effort, and don't get discouraged if success doesn't come quickly. Remember that real, lasting achievements take time, just like growing a beautiful garden.