Authors:

It's important for you to understand that stock and bonds go up-and they go down. You need to be comfortable with that fact.

Taylor Larimore, Mel Lindauer, Michael LeBoeuf (2014). “The Bogleheads' Guide to Investing”, p.129, John Wiley & Sons
It's important for you to understand that stock and bonds go up-and they go down. You need to be comfortable with that fact.