31 So then, don’t worry saying, ‘What will we eat?’ or ‘What will we drink?’ or ‘What will we wear?’ 32 For the unconverted pursue these things, and your heavenly Father knows that you need them. 33 But above all pursue his kingdom and righteousness, and all these things will be given to you as well. 34 So then, do not worry about tomorrow, for tomorrow will worry about itself. Today has enough trouble of its own.

The Gemara quotes additional statements from the book of Ben Sira: Do not suffer from tomorrow’s trouble, that is, do not worry about problems that might arise in the future, as you do not know what a day will bring. Perhaps when tomorrow comes, the individual who was so worried will not be among the living, and he was consequently upset over a world that is not his. Prevent a crowd from inside your house, do not let many people enter, and do not even bring all your friends into your house. Make sure, however, that a crowd seeks your welfare, and that you have many allies. Reveal a secret to only one in a thousand, since most people are unable to keep a secret.