"我们对明天实现的唯一限制将是我们今天的怀疑。"

Simplified Meaning:

The message here is that the only thing stopping us from achieving our dreams and goals in the future are the doubts and fears we have right now. Imagine a student who wants to become a doctor. If they constantly doubt their ability to pass difficult exams or think they are not smart enough, these doubts will prevent them from even trying. But if they believe in themselves and work hard, they will have a better chance of reaching their goal. In history, many inventors faced doubts, but those who believed in their ideas, like Thomas Edison with the light bulb, found success. This idea teaches us that we need to trust ourselves and not let today's uncertainties hold us back. If we focus on our goals and stay positive, we are more likely to succeed. We can apply this by taking small steps every day towards our dreams and not letting fear stop us from trying.