The hypocrite will not always call upon God; he will not persevere in prayer; he will not hold on nor hold out in prayer; he is short-spirited; he cannot always pray and not faint, or shrink back as sluggards do in work, or cowards in war. An hypocrite, for lack of an inward principle, can neither delight in God, nor always call upon God. If God comes not at his call, if he opens not as soon as he knocks, he is out of patience, and ready to say with that proud profane prince, “Behold, this evil is of the Lord, and why should I wait for him any longer?” 2Kings 6:33
If an hypocrite obtains the mercy he desires, then he will throw off prayer, as he said, “take away the net, the fish is caught;” if he obtains not the mercy, then he will grow weary of his duty. Prayer is too hard and too high a work for an unsound heart to hold on in. Prayer is heart-work, and that proves heavy work to him. The soul of prayer lies in the pouring out of the soul before God, and this is a work that an hypocrite has no skill in.”
This picture is taken by Eduardo Valdivia and it's called "Embrace", I thought it fitting to represent the soul of man united with the heart of God.