“Worry:Interest paid on trouble before it falls due.”
“Worry is interest paid on trouble before it comes due.”
“...and whether or not we had now paid our dues, he was my blessing, and I was his...”
“Due to man’s curiosity, he will always get in trouble.”
“The greater part of the world's troubles are due to questions of grammar.”
“Worry is the intrest paid by those who borrow trouble.”