No one ought to undertake teaching about prayer who has not spent more toil in the practice of prayer than on its principle. P.T. Forsyth, The Soul of Prayer
Ole Hallesby explains how we often make prayer harder than it has to be.
Ole Hallesby describes the second key to prayer: faith (and how it isn't what you think)
Ole Hallesby explains what prayer is and how a sense of helplessness is essential to it