Full Idea
According to Hobbes, if we fully know what a man desires and believes, and we know the state of his physical stimuli, we may logically deduce what he will try to do. But Kant says no such statements can ever imply what a man will do.
Gist of Idea
For Hobbes (but not for Kant) a person's actions can be deduced from their desires and beliefs
Source
Roderick Chisholm (Human Freedom and the Self [1964], p.32)
Book Reference
'Free Will', ed/tr. Watson,Gary [OUP 1982], p.32