You can read the sermon by Spurgeon that influenced Tim here.
Prayer that Tears the Roof Off if Necessary
Does Your Prayer Life Look Like Devotion to Prayer?
Consider Others in Order to Stir Them Up
God Exposes Your Sin in Order to Save You
Continue Steadfastly in Prayer
The Vital Importance of Prayer
Importunity in Prayer
Laying Hold of The Lord in Prayer
Missions and Prayer
And There He Prayed | Personal Disciplines of Private Prayer
Men of Prayer in History
Song of Solomon (Prayer as Communion)
Is Facebook Keeping You From Prayer?
A Call to Prayer
A Story of Hudson Taylor’s Answer to Prayer