Charles H. Spurgeon on Psalms 137:4

How shall we sing the Lord's song in a strange land? Now, is it not true that, in many senses, we, like the Jewish exiles, have to sing the Lord's song in a strange land? If not a land strange to us, then, all the more strange to it —a land foreign, so to say, and alien to the Lord's song. The very life which we live here in the body is a life of sight and sense. Naturally we walk by sight; and to sing the Lord's song is possible only to faith. Faith is the soul's sight: faith is seeing the Invisible: this comes not of nature, and without this we cannot sing the Lord's song, because we are in a land strange to it. Again, the feelings of the present life are often adverse to praise. The exiles in Babylon could not sing because they were in heaviness. God's hand was heavy upon them. He had a controversy with them for their sins. Now the feelings of many of us are in like manner adverse to the Lord's song. Some of us who are in great sorrow. We have lost a friend; we are in anxiety about one who is all to us; we know not which way to turn for tomorrow's bread or for this day's comfort. How can we sing the Lord's song? And there is another kind of sorrow, still more fatal, if it be possible, to the lively exercise of adoration. And that is, a weight and burden' of unforgiven sin. Songs may be heard from the prison cell of Philippi; songs maybe heard from the calm death bed, or by the open grave; but songs cannot be drawn forth from the soul on which the load of God's displeasure, real or imagined, is lying, or which is still powerless to apprehend the grace and the life for sinners which is in Christ Jesus. That, we imagine, was the difficulty which pressed upon the exile Israelite; that certainly is an impediment now, in many, to the outburst of Christian praise. And again, there is a land yet more strange and foreign to the Lord's song even than the land of unforgiven guilt —and treat is the land of unforsaken sin. —Condensed from C. J. Vaughan.