Full Idea
The voyage of our reason may proceed only as far as the continuous coastline of experience reaches.
Gist of Idea
The voyage of reason may go only as far as the coastline of experience reaches
Source
Immanuel Kant (Critique of Pure Reason [1781], B406-/A395)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.439
A Reaction
This is a strikingly empiricist remark, coming from Kant. It is certainly a firm rejection of what we might call 'speculative metaphysics', but allows what Peter Strawson calls 'descriptive metaphysics'. Cf. Idea 3722.
Related Idea
Idea 3722 Metaphysics goes beyond the empirical, so doesn't need examples [Kant]