Substansie is ‘n filosofiese term wat verwys na die fundamentele draer van eienskappe – dit wat onderliggend bestaan en waaraan eienskappe toegeskryf word. ‘n Substansie bestaan onafhanklik en dien as die basis waarop aksidente (veranderlike eienskappe) rus. ‘n Appel het byvoorbeeld eienskappe soos rooiheid, soetheid en rondheid, maar die appel-substansie is dit wat hierdie eienskappe dra; selfs as die appel van groen na rooi verander, bly die onderliggende substansie dieselfde. Hierdie konsep is belangrik in die Christelike teologie, waar God se substansie of wese onderskei word van Sy eienskappe, en waar die een goddelike substansie in drie Persone bestaan.
Substance is a philosophical term referring to the fundamental bearer of properties – that which exists underlying and to which properties are attributed. A substance exists independently and serves as the basis on which accidents (variable properties) rest. An apple, for example, has properties such as redness, sweetness, and roundness, but the apple-substance is that which bears these properties; even if the apple changes from green to red, the underlying substance remains the same. This concept is important in Christian theology, where God’s substance or being is distinguished from His attributes, and where the one divine substance exists in three Persons.