I do, however, know the origin of the phrase. If the words are truly Reed's, they were a response to his epony-nemesis, Herbert Read. Read's most famous poem of World War II is "To a Conscript of 1940," in which a veteran of the First World War addresses a new recruit:
'... There are heroes who have heard the rally and have seenThis is not exactly the sentiment of Rupert Brooke, but Reed (as a conscript of 1941) would still have certainly been in some disagreement, even though the war, for him, was little more than a terrible personal inconvenience.
The glitter of garland round their head.
Theirs is the hollow victory. They are deceived.
But you my brother and my ghost, if you can go
Knowing that there is no reward, no certain use
In all your sacrifice, then honour is reprieved.
To fight without hope is to fight with grace,
The self reconstructed, the false heart repaired.'