Jerry Spinelli said this quote

Live today. Not yesterday. Not tomorrow. Just today. Inhabit your moments. Don’t rent them out to tomorrow. Do you know what you’re doing when you spend a moment wondering how things are going to turn out with Perry?You’re cheating yourself out of today. Today is calling to you, trying to get your attention, but you’re stuck on tomorrow, and today trickles away like water down a drain. You wake up the next morning and that today you wasted is gone forever. It’s now yesterday. Some of those moments may have had wonderful things in store for you , but now you’ll never know.