“If you start by promising what you don’t even have yet, you’ll lose your desire to work towards getting it.”

Simplified Meaning:

Making big promises about things you don't have can be a bad idea because it can make you less motivated to actually achieve those things. Imagine telling everyone you'll buy a fancy car next year, even though you don't have the money yet. You might feel proud talking about it, but knowing you haven't done the work to save up could make you less eager to start saving. The excitement of the promise can take away your drive to actually work for it. In history, think about explorers who promised to find new lands. If they bragged about their future discoveries without preparing properly, they might have never made it. In real life, it's better to set smaller goals you can achieve bit by bit. Instead of promising something huge, focus on making steady progress. This way, you stay motivated and more likely to reach your goal.