Full Idea
All appearances contain that which persists (substance) as the object itself, and that which can change as its mere determination (i.e. the way in which the object exists). ...[2nd ed] In all change of appearances substance persists.
Gist of Idea
All appearances need substance, as that which persists through change
Source
Immanuel Kant (Critique of Pure Reason [1781], B224/A182)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.299
A Reaction
This is a full-blooded commitment by Kant to the traditional Aristotelian concept of a substance which endures through the change in its accidental features. Though in Kant's case the commitment is 'transcendental', not realist.