Excerpt from All Things for Good (aka A Divine Cordial) by Thomas Watson
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The prayers of Saints work for good to the godly.
The saints pray for all the members of the body mystical, their prayers prevail much. They prevail for recovery from sickness. ‘The prayer of faith shall save the sick, and the Lord shall raise him up’ (James 5:15). They prevail for victory over enemies. ‘Lift up thy prayer for the remnant that is left’ (Isaiah 37:4). ‘Then the angel of the LORD went forth, and smote, in the camp of the Assyrians, an hundred and fourscore and five thousand’ (Isaiah 37:36). They prevail for deliverance out of prison. ‘Prayer was made without ceasing of the church unto God for him. And behold the angel of the Lord came upon him, and a light shined in the prison, and he smote Peter on the side, and raised him up, and his chains fell off’ (Acts 12:5-7). The angel fetched Peter out of prison, but it was prayer fetched the angel. They prevail for forgiveness of sin. ‘My servant Job shall pray for you, for him will I accept’ (Job 42:8). Thus the prayers of the saints work for good to the body mystical. And this is no small privilege to a child of God, that he has a constant trade of prayer driven for him. When he comes into any place, he may say, ‘I have some prayer here, nay, all the world over I have a stock of prayer going for me. When I am indisposed, and out of tune, others are praying for me, who are quick and lively.’ Thus the best things work for good to the people of God.