Full Idea
A good will seems to constitute the indispensable condition of our very worthiness to be happy.
Gist of Idea
Only a good will makes us worthy of happiness
Source
Immanuel Kant (Groundwork of the Metaphysic of Morals [1785], 393.2)
Book Reference
Kant,Immanuel: 'The Moral Law (Groundwork of Morals)', ed/tr. Paton,H.J. [Hutchinson 1948], p.59