Charles H. Spurgeon on Psalms 137:1

We wept when we remembered Zion. A godly man lays to heart the miseries of the church. I have read of certain trees, whose leaves if cut or touched, the other leaves contract and shrink up themselves, and for a space hang down their heads: such a spiritual sympathy is there among Christians; when other parts of God's church suffer, they feel themselves, as it were, touched in their own persons. Ambrose reports, that when Theodosius was sick unto death, he was more troubled about the church of God than about his own sickness. When Aeneas would have saved Anchises' life, saith he, "Far be it from me that I should desire to live when Troy is buried in its ruins." There are in music two unisons; if you strike one, you shall perceive the other to stir, as if it were affected: when the Lord strikes others a godly heart is deeply affected, Isa 16:11: "My bowels shall sound like an harp." Though it be well with a child of God in his own particular, and he dwells in an house of cedar, yet he grieves to see it go ill with the public. Queen Esther enjoyed the king's favour, and all the delights of the court, yet when a bloody warrant was signed for the death of the Jews she mourns and fasts, and ventures her own life to save theirs. —Thomas Watson.