Second Council of Constantinople
Second Council of Constantinople, Capitulum I
Sentence of the synod and fourteen capitula; not the full proceedings
Capitulum I
If anyone shall not confess that the nature or essence of the Father, of the Son, and of the Holy Ghost is one, as also the force and the power; [if anyone does not confess] a consubstantial Trinity, one Godhead to be worshipped in three subsistences or Persons: let him be anathema. For there is but one God even the Father of whom are all things, and one Lord Jesus Christ through whom are all things, and one Holy Spirit in whom are all things.
Translation: Henry R. Percival, The Seven Ecumenical Councils, NPNF II.14 (1900), via CCEL.
Source: Second Council of Constantinople (CCEL)