"No les digas lo que vas a hacer. No les digas lo que has hecho. Muéstrales lo que estás haciendo."

Simplified Meaning:

Instead of talking about your plans or boasting about your past achievements, show people the actions you are taking right now. Actions speak louder than words. Imagine you're a student working on a science project. Instead of telling your friends about your amazing idea or how well you did in last year's project, start building the project and let them see your progress and hard work. This approach will impress them more effectively than any words could. It teaches us that demonstrating our abilities through our current actions is more impactful and persuasive than simply talking about them. By focusing on what we are actively doing, we gain more respect and credibility. So, if you want people to notice or believe in you, let your ongoing efforts speak for themselves.