1. Sat - The usual posture of mourners.

2. Harps - Harps are here put for all instruments of musick.

3. A song - Such songs as you used to sing in the temple of Zion.

4. The Lord's - Those songs which were appointed by God to be sung only in his service.

6. If - If I do not value Jerusalem's prosperity more than all other delights.

7. The day - In the time of its destruction.

8. Happy - As being God's instrument to vindicate his honour, and execute his just judgments.