Full Idea
A holy will is one which is incapable of any maxims which conflict with the moral law
Clarification
A 'maxim' is a principle followed in an action
Gist of Idea
A holy will is incapable of any maxims which conflict with the moral law
Source
Immanuel Kant (Critique of Practical Reason [1788], I.1.1.§7)
Book Reference
Kant,Immanuel: 'Critique of Practical Reason (Third edition)', ed/tr. Beck,Lewis White [Library of Liberal Arts 1993], p.32
A Reaction
If such a will is 'incapable' of conflicting with moral law, it will not need to think or assess before action. This means that Kant's moral ideal can ultimately exclude the free-thinking intellect. Kant is describing a state of true Aristotelian virtue.