Charles H. Spurgeon on Psalms 4:7

"Thou hast put gladness in my heart." The comforts which God reserves for his mourners are filling comforts (Romans 15:13); "The God of hope fill you with joy" (John 16:24); "Ask that your joy may be full." When God pours in the joys of heaven they fill the heart, and make it run over (2 Corinthians 7:4); "I am exceeding joyful;" the Greek is, I overflow with joy, as a cup that is filled with wine till it runs over. Outward comforts can no more fill the heart than a triangle can fill a circle. Spiritual joys are satisfying (Psalm 63:5); "My heart shall be satisfied as with marrow and fatness; and my mouth shall praise thee with joyful lips;" "Thou hast put gladness in my heart." Worldly joys do put gladness into the face, but the spirit of God puts gladness into the heart; divine joys are heart joys (Zechariah 10:7; John 16:22); "Your heart shall rejoice" (Luke 1:47); "My spirit rejoiced in God." And to show how filling these comforts are, which are of a heavenly extraction, the psalmist says they create greater joy than when "corn and wine increase." Wine and oil may delight but not satisfy; they have their vacuity and indigence. We may say, as Zechariah 10:2, "They comfort in vain;" outward comforts do sooner cloy than cheer, and sooner weary that fill. Xerxes offered great rewards to him that could find out a new pleasure; but the comforts of the Spirit are satisfactory, they recruit the heart (Psalm 94:19), "Thy comforts delight my soul." There is as much difference between heavenly comforts and earthly, as between a banquet that is eaten, and one that is painted on the wall. Thomas Watson.