Full Idea
What can be perceived by the senses is really secondary and not self-standing, while thoughts, on the contrary, are what is genuinely independent and primitive.
Gist of Idea
Sense perception is secondary and dependent, while thought is independent and primitive
Source
Georg W.F.Hegel (Logic (Encyclopedia I) [1817], §41 Add2)
Book Reference
Hegel,Georg W.F.: 'The Hegel Reader', ed/tr. Houlgate,Stephen [Blackwell 1998], p.154
A Reaction
Although this is post-Kant, it strikes me as a perfect slogan for rationalism. Personally I would say that such a dichotomy is becoming a historical relic, in the light of modern understanding of the brain. Experience and thought are inextricable.