“Do not borrow tomorrow's troubles today”
“Nothing could be gained by worrying and dreading the future, borrowing tomorrow's pain for today.”
“The duty of planning tomorrow's work is today's duty; though its material is borrowed from the future, the duty, like all duties, is in the Present.”
“The key is this: Meet today's problems with today's strength. Don't start tackling tomorrow's problems until tomorrow. You do not have tomorrow's strength yet. You simply have enough for today.”
“Do not ruin today with mourning tomorrow.”
“You don't borrow trouble.”