Many of us are humbled by the life of George Mueller and his prayer alone for money to come in. You could engage in prayer alone, you could pray and and give some information to the need or you could pray, give information about the need and ask for their financial help. Moody would type hundreds of appeal letter to be sent out, spread them out for the ink to dry (they did not have copiers), and send them out. Moody felt that faith was doing something as well as believing something. He said, "I show my faith when I go to men and state to them the needs of the Lord's work and ask them to give to it."
Moody, even in his time, raised millions of dollars for the different schools and ministries he was associated with. Prayer, information and appeal were all part of his ministry.