Loved this story from Greg Stier:
The great revivalist Gypsy Smith was once asked by a young pastor how he could start a revival at his church. The evangelist simply told him to go home, draw a circle on the floor with a piece of chalk, and kneel within that circle. He then instructed him to pray for revival for everyone on the inside of that circle and, after that, he would start to see revival on the outside of that circle.
Read the whole article.