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1 " Evil is the most difficult problem in the world. It is also the strongest objection to God’s existence. If God does exist, it is also the most problematic challenge to his nature and power. As a Christian, it is my greatest temptation for doubt and unbelief. "
― , Clear Minds & Dirty Feet: A Reason to Hope, a Message to Share
2 " Future is the most difficult problem of our era. "
― Pearl Zhu , Digital Valley: Five Pearls of Wisdom to Make Profound Influence (Digital Master Book 3)
