Helping others in need dispels darkness from one's own heart and brings blessing.

Original passage

Often prayer is solicited for the afflicted, the sorrowful, the discouraged; and this is right. We should pray that God will shed light into the darkened mind and comfort the sorrowful heart. But God answers prayer for those who place themselves in the channel of His blessings. While we offer prayer for these sorrowful ones, we should encourage them to try to help those more needy than themselves. The darkness will be dispelled from their own hearts as they try to help others. As we seek to comfort others with the comfort wherewith we are comforted, the blessing comes back to us.