Full Idea
There are virtues (such as courage) that would not be present in a paradise.
Gist of Idea
Paradise would not contain some virtues, such as courage
Source
Brian Davies (Introduction to the Philosophy of Religion [1982], 3 'Evil')
Book Reference
Davies,Brian: 'An Introduction to the Philosophy of Religion' [OUP 1993], p.39
A Reaction
Part of a suggestion that morality would be entirely inapplicable in paradise, and so we need dangers etc in the world.