"Prayer is not getting man's will done in heaven, but getting God's will done on earth. It is not overcoming God's reluctance but laying hold of God's willingness."
Richard C. Trench -- Read about it in "Yes" Will Come
"Only those who see the invisible can attempt the impossible."
Dick Eastman -- Try An Open Door for more about this.
"More things are wrought by prayer than this world dreams of."
Alfred Lord Tennyson
"It is the habit of faith, when she is praying, to use pleas. Mere prayer sayers, who do not pray at all, forget to argue with God; but those who prevail bring forth their reasons and their strong arguments"
Charles H. Spurgeon
"God does nothing but by prayer, and everything with it."
John Wesley -- Chance Thoughts develops this theme.
"Most men pray for power, the strength to do things. Few people pray for love, the quality to be someone."
Robert Foster