display command from imagemagick allows me to preview fonts:
However, the text is always the same ('That which does not destroy me, only makes me stronger'). Is there a way to change the standard text?
You would have to alter the source code (more specifically the TTF coder, line 276) and recompile IM if you want to have a different text sample in font preview.
There is a script for ImageMagick tools to show fonts with several bells & whistles http://www.imagemagick.org/Usage/scripts/show_fonts.