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I am also very grateful for God's promise in Isaiah 55:10-11, which reads:
"As the rain and snow come down from Heaven, and do not return to it without watering the earth and making it bud and flourish, so that it yields seed for the sower and bread for the eater, so is my word that goes out from my mouth: It will not return to me empty, but will accomplish what I desire and achieve the purpose for which I sent it."
Even if you believe someone to be too hard hearted, too set in their ways to open their heart to the gospel, don't give up praying for them. Our God is mighty to save! Give away God's word generously! Don't rely on your words to convince people of the Truth - trust in His Word! God never promised to use our words, but He has promised to yield great fruit from His Word!