Whereby they have made Thee glad. Psalm 45:8
"AND
Q: who are thus privileged to make the Savior glad?
A: His church—His people.
Q: But is it possible? He makes us glad, but how can we make Him glad?
A: By our love. Ah! we think it so cold, so faint; and so, indeed, we must sorrowfully confess it to be, but it is very sweet to Christ.
Hear His own eulogy of that love in the golden Canticle: "How 
fair is thy love, my sister, my spouse! how much better is thy love than wine!" Song of Solomon 4:10
See, loving heart, how He delights in you.
--When you lean your head on His bosom, you not only receive, but you give Him joy;
--when you gaze with love upon His all-glorious face, you not only obtain comfort, but impart delight.
--Our praise, too gives Him joy—not the song of the lips alone, but the melody of the heart's deep gratitude.
***It is in your power even now to break the alabaster box, and pour the precious oil of joy upon His head, as did the woman of old, whose memorial is to this day set forth wherever the gospel is preached.
Q: Will you not perfume your beloved Lord with the myrrh and aloes, and cassis, of your heart's praise?
Yes, ye ivory palaces, ye shall hear the songs of the saints!"
Charles Spurgeon