With Christ in the School of Prayer, by Andrew Murray, 18

And now, all ye who have anew entered the school of Christ to be taught to pray, take these lessons, practise them, and trust Him to perfect you in them. Dwell much in the inner chamber, with the door shut—shut in from men, shut up with God; it is there the Father waits you, it is there Jesus will teach you to pray.  To be alone in secret with THE FATHER: this be your highest joy. To be assured that THE FATHER will openly reward the secret prayer, so that it cannot remain unblessed: this be your strength day by day.  And to know that THE FATHER knows that you need what you ask; this be your liberty to bring every need, in the assurance that your God will supply it according to His riches in Glory in Christ Jesus.
This post continues what is intended to be a series of excerpts from With Christ in the School of Prayer, by Andrew Murray. I thank the Christian Classics Ethereal Library for making this public domain work available. To see their post of the book, go here. The previous post is here. As usual in this blog, long quotations are in this color.