If no effort was too difficult, then any effort was available, and help came to the poor. If any effort was too difficult, then no effort was available, and the poor had to fend for themselves. "Spare" in this case has the meaning of holding in reserve.
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deadratIf no effort was too difficult, then any effort was available, and help came to the poor.So is the book's translation wrong? Does the first sentence mean he reserved no effort to help the poor?