What you say is important, and the font you use to say it is also incredibly important.
For most people, picking a font is a simple case of what looks good - you scroll through the options, make a choice and move on.
Except it's not really that simple.
As most designers (definitely the ones at Slash) can tell you, there is a pretty deep science behind fonts and typefaces, not just based on visuals, but on how they make you feel.
Yup, they give you the feels, and you can read all about it at the link.