It is perhaps that hardest objection to overcome. St. Thomas Aquinas gave a good crack at it IMO ( <a href="http:&#x2F;&#x2F;www.newadvent.org&#x2F;summa&#x2F;1049.htm" rel="nofollow">http:&#x2F;&#x2F;www.newadvent.org&#x2F;summa&#x2F;1049.htm</a> )<p>Something I find insightful is he argues that, like cold is an absence of heat, evil is simply an absence of good (God, grace, ect.)