Sum and Substance is a compilation album released by the British rock band The Mission on 7 February 1994 through Vertigo/Phonogram Records. It contains all the singles released by the band as well as two new songs. The vinyl version on two LP's had a slightly different track-listing. A remix of "Tower of Strength" by Youth preceded the release, although it was not included on the compilation. A second single "Afterglow" appeared in March of the same year, but failed to chart. A VHS with all the music videos produced by the band bears the same title. The band did a short tour around the UK in support of the release.