Full Idea
Transcendental philosophy is the act of consciousness whereby the subject becomes the originator of itself and, thereby, of the whole object of technical-practical and moral-practical reason in one system - ordering all things in God
Gist of Idea
Transcendental philosophy is the subject becoming the originator of unified reality
Source
Immanuel Kant (Posthumous notes [1799], 21:78, p.245), quoted by A.W. Moore - The Evolution of Modern Metaphysics 06 App
Book Reference
Moore,A.W.: 'The Evolution of Modern Metaphysics' [CUP 2013], p.161
A Reaction
This is evidently Kant's last word on the matter (c.1799), and Moore says he was drifting close to Fichte's idealism, in which reality is actually (sort of) created by our own minds. Disappointing! God's role here is unclear.