Full Idea
Love of man is required by itself, in order to present the world as a beautiful moral whole in its full perfection, even if no account is taken of advantages (of happiness).
Gist of Idea
The love of man is required in order to present the world as a beautiful and perfect moral whole
Source
Immanuel Kant (Metaphysics of Morals II:Doctrine of Virtue [1797], 458 I.II)
Book Reference
Kant,Immanuel: 'The Metaphysics of Morals', ed/tr. Gregor,Mary [CUP 1991], p.251
A Reaction
For me, this illustrates the basic problem with Kant. In the Groundwork he presents morality as arising from pure reason, deriving moral maxims from contradictions, but here we find a totally ungrounded assertion of grand traditional values.