is all about chilling out and not stressing over what might happen tomorrow. It's like saying,
Hey, focus on today, deal with what's in front of you, and don't get lost in future worries. Basically, each day has its own stuff, so tackle that instead of borrowing trouble from tomorrow.Matthew 6:34

Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of its own.Matthew 6:34: