Answer:
"A good man's prayers are golden recompense!"
Step-by-step explanation:
Remember that a metaphor is a figure of speech that compares, in an implied or hidden way, two things which seem unrelated. Metaphors state that one thing is another thing. By doing this, authors help themselves explain complex ideas or feelings in a deeper/better way as they often appeal to the readers' emotions.
In this case old Roger compared "good man's prayers" with "golden recompense". This means that the prayers are very valuable to him, the high value of the gold resembles the high value of the prayers.