Believer, closet prayer will be found to be but a lifeless, comfortless thing, if you do not enjoy communion with God in it.  That should be the very soul of all your closet duties, therefore press after it, as for life; when you go into your closet banish everything that can hinder your enjoyment of Christ.

True grace makes all new, the inside new, and the outside new; "If any man be in Christ he is a new creature."

Want of private duties is the great reason why the hearts of many are so dead and dull, so formal and carnal, so barren and unfruitful under public ordinances.  Oh, that Christians would seriously lay this to heart!  Certainly that man’s heart is best in public duties, who is most frequent in private exercises; they make most earnings in public ordinances, who are most conscientiously exercised in closet communings.

From Smooth Stones (Spurgeon’s collected sayings of Thomas Brooks)