Psalms 137 · John Wesley
2Sat - The usual posture of mourners.
3Harps - Harps are here put for all instruments of musick.
4A song - Such songs as you used to sing in the temple of Zion.
5The Lord's - Those songs which were appointed by God to be sung only in his service.
7If - If I do not value Jerusalem's prosperity more than all other delights.
8The day - In the time of its destruction.
9Happy - As being God's instrument to vindicate his honour, and execute his just judgments.