Imagine you put on dark, gray glasses inside the house. Everything would look sad and dark, right? Even if there's cake and toys right in front of you! That's what happens when we wake up complaining ("Ugh, I don't want to get up," "Ugh, it's raining"). We put on the "Sad Glasses" and the day turns bad.
But the Bible says whoever has a "cheerful heart" wears the "Party Glasses." Even if it rains, that person thinks: "Yay, I get to jump in the puddles!" Even if there's broccoli, she thinks: "I'm going to get strong!" Everything depends on the glasses you choose to wear.