"No creas nada de lo que oigas y solo la mitad de lo que veas"

Simplified Meaning:

It's important to be careful about what information you trust. Sometimes, people might lie, exaggerate, or make mistakes when they tell you things. Even when you see something with your own eyes, it might not show the whole truth. For example, if you see someone smiling, you might think they're happy, but they could be hiding their sadness. Take the story of the Trojan Horse from history: the Greeks left a huge wooden horse outside Troy, pretending it was a gift. The Trojans saw it and believed the Greeks had left, but they didn't know Greek soldiers were hiding inside the horse. When the Trojans brought it into their city, the soldiers came out at night and attacked. So, always be a little skeptical. Ask questions and look closer before you decide what’s real. This way, you can make smarter choices and avoid being tricked or misled.