We believe in one God,
      the Father almighty,
      maker of heaven and earth,
      of all things visible and invisible.

And in one Lord Jesus Christ,
      the only Son of God,
      begotten from the Father before all ages,
           God from God,
           Light from Light,
           true God from true God,
      begotten, not made;
      of the same essence as the Father.
      Through him all things were made.
      For us and for our salvation
           he came down from heaven;
           he became incarnate by the Holy Spirit and the virgin Mary,
           and was made human.
           He was crucified for us under Pontius Pilate;
           he suffered and was buried.
           The third day he rose again, according to the Scriptures.
           He ascended to heaven
           and is seated at the right hand of the Father.
           He will come again with glory
           to judge the living and the dead.
           His kingdom will never end.

And we believe in the Holy Spirit,
      the Lord, the giver of life.
      He proceeds from the Father [and the Son],
      and with the Father and the Son is worshiped and glorified.
      He spoke through the prophets.
      We believe in one holy catholic and apostolic church.
      We affirm one baptism for the forgiveness of sins.
      We look forward to the resurrection of the dead,
      and to life in the world to come. Amen.

But when the Helper comes, whom I will send to you from the Father, the Spirit of truth, who proceeds from the Father, he will bear witness about me (John 15:26 ESV).

The doctrine formulation approved at Nicaea—and the subsequent Nicene Creed (as we know it) adopted at the Council of Constantinople (381)—affirmed that the Holy Spirit “proceeds from the Father.” Later, as the Arians continued to reject the full deity of the Son, churches in the West began to confess that the Holy Spirit “proceeds from the Father and the Son.” In Latin, the phrase “and the Son” is one word: filioque. That new word was added to the Nicene Creed at the Council of Toledo (589) and has been accepted in the Western church—implicitly at first, and over time explicitly—ever since.

… .

Although John 15:26 says that the Spirit proceeds from the Father and does not mention procession from the Son, the latter truth is impled by the teaching in John 16 that whatever the Father has, the Son has as well.