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Looks like you found the Wesley quote, but for what it's worth, here's an entry I made in my journal about a year ago:

God will not do anything in the world unless someone prays it into being (even something that is according to His will).
Examples:
-- Daniel having to pray for the release of the Hebrews from Babylon, even after the allotted time of their captivity had passed. (Dan. 9:2-3)
-- God encouraging the watchmen to not stop beseeching Him until "Jerusalem becomes a praise and blessing to the world." )Isa. 62:6-7)
-- God looking to and fro for a faithful person to stand in the gap, so God would not destroy the land. (Eze. 22:30)
-- Jesus commenting on how he couldn't do certain miracles in a region because of people's unbelief. (Which suggests that the reason we don't see miracles today is that the church lacks the faith required to bring the miracles into effect.) (Matt. 13:58)
-- God's admonition in 2 Chron. 7:12 that "if my people...humble themselves and pray..." God would heal their land. The land's healing was conditional upon God's people humbling themselves and praying.
Even though God binds His action and makde them conditional upon the faith and prayers of His people, God is still sovereign. He is sovereign in that He calls people to such ministries of intercession, and then sovereignly dispenses or supplies the faith necessary to respond to tha tcall, and thereby bring His gracious will into being, often through miraculous means.