Proverbs 13:12 in the World English Bible
Hope deferred makes the heart sick, but when longing is fulfilled, it is a tree of life.
Context
11 Wealth gotten by vanity shall be diminished: but he that gathereth by labour shall increase.
12 Hope deferred maketh the heart sick: but when the desire cometh, it is a tree of life.
13 Whoso despiseth the word shall be destroyed: but he that feareth the commandment shall be rewarded.