Proverbs 13:12 in the King James Version
Hope deferred maketh the heart sick: but when the desire cometh, it is a tree of life.
Context
11 Wealth gained dishonestly dwindles away, but he who gathers by hand makes it grow.
12 Hope deferred makes the heart sick, but when longing is fulfilled, it is a tree of life.
13 Whoever despises instruction will pay for it, but he who respects a command will be rewarded.