Of all the list of Christian duties there is none to which there is such abounding encouragement as prayer. It is a duty which concerns all. High and low, rich and poor, learned and unlearned—all must pray. It is a duty for which all are accountable. All cannot read, or hear, or sing; but all who have the spirit of adoption can prayer. Above all, it is a duty in which everything depends on the heart and motive within. Our words may be feeble and ill-chosen, and our language broken and ungrammatical, and unworthy to be written down. But if the heart be right, it matters not. He that sits in the heaven can spell out the meaning of every petition sent up in the name of Jesus, and can make the asker know and feel that he receives.
J. C. Ryle, Expository Thoughts on the Gospels–St. John, Vol. III, p. 152, comments based on John 16:23-24.