Full Idea
In the subject there is no antecedent feeling tending to morality; that is impossible, because all feeling is sensuous, and the drives of the moral disposition must be free from every sensuous condition.
Gist of Idea
People cannot come to morality through feeling, because morality must not be sensuous
Source
Immanuel Kant (Critique of Practical Reason [1788], I.1.III)
Book Reference
Kant,Immanuel: 'Critique of Practical Reason (Third edition)', ed/tr. Beck,Lewis White [Library of Liberal Arts 1993], p.79
A Reaction
I'm not quite clear (even after reading Kant) why moral drives 'must' be free of sensuousness. Aristotle gives a much better account, when he tells us that the sensuous drives must be trained in the right way, and must be in harmony with the reason.