"Make it a habit to tell people thank you. To express your appreciation, sincerely and without the expectation of anything in return. Truly appreciate those around you, and you'll soon find many others around you. Truly appreciate life, and you'll find that you have more of it."

Marston is basically saying: don’t keep your gratitude locked in your head. Say it out loud. When you tell people “thank you” and really mean it, with no strings attached, you make them feel seen, and that changes the whole tone of your relationships. Think of how it feels when a coworker genuinely thanks you for helping, or a friend says they appreciate you just for being you. You stand a little taller, right? The more you notice and acknowledge the good in people and in your life, the more of it you start to see. It’s not magic; your focus just shifts. Life doesn’t suddenly become perfect, but it feels fuller, richer, and a lot less lonely.