"Treasure what you have before you lose it," is a pretty common english saying. I don't think there is anything more true than that (there probably is something a fuck tonne more true lol). There is a similar Buddhist teaching to this. Essentially, it says, "Learn to appreciate and treasure the things that are currently in your possession. If you appreciate, treasure and pay more attention to what you desire but do not yet have, not only will you undervalue what you have now, you can also risk losing it. Once you lose it, you will experience suffering (grief/sadness etc). So don't keep your eyes fixed on what was and what could be, focus on what is."

Work hard today for a better tomorrow