Full Idea
Without sensibility no object would be given to us, and without understanding none would be thought. Thoughts without content are empty, intuitions without concepts are blind.
Gist of Idea
Thoughts without content are empty, intuitions without concepts are blind
Source
Immanuel Kant (Critique of Pure Reason [1781], B075/A51)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.193
A Reaction
A famous assertion, which requires quite a lot of deconstruction. See MacDowell 1994 for example. Whatever the solution, it had better allow animals to cope with their world, because that's what they do.