In commenting on Psalm 45 (http://is.gd/dqrDD) Charles Spurgeon wrote:
“Whereby they have made thee glad.” And who are thus privileged to make the Saviour glad? His Church his people. But is it possible? He makes us glad, but how can we make him glad? By our love. 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. He loves us, not for the value of what we give, but for the motive from which the gift springs.
Often we forget that our Lord looks at the intent of the heart in all matters, not only sin but also praise and worship. Ours need not always be a grand expression of our love to Him; the smallest gesture, the quiet whisper, the silent prayer, if they come from the heart with the attitude of love are just as pleasing to God as any other way we might praise Him.