The hymn the Church sings whenever she needs the Holy Spirit to act.
The Church’s oldest and most used invocation of the Holy Spirit.
When: At Pentecost, at ordinations, at confirmations, at the opening of a council or a conclave, and at the start of anything that will need more than your own strength.
Why: It asks for the one thing no plan can supply. A household that sings it before a decision is admitting the decision is not theirs alone.