What is the filioque clause/controversy?

from the old testament

• The Old Testament establishes that the Holy Spirit is God’s own Spirit, truly divine and personal. David prayed, “take not your Holy Spirit from me,” recognizing that fellowship and service depend on God’s Spirit present with His people (Psalm 51:11). Isaiah later recalls Israel grieving “his Holy Spirit,” again treating the Spirit as God Himself drawing near to act (Isaiah 63:10–11).
• The Spirit is shown as God’s life-giving power who creates, equips, and guides. In Genesis 1:2, “the Spirit of God was hovering” over the waters. Throughout Israel’s history, God places His Spirit upon chosen servants to enable wisdom and leadership, such as when He took some of the Spirit on Moses and put it upon elders to bear the burden with him (Numbers 11:25–29). These scenes teach that the Spirit comes from God, accomplishes God’s works, and remains God’s to give and withdraw.
• The prophets promise a future, generous outpouring of the Spirit that will renew God’s people. Joel declares, “I will pour out my Spirit on all flesh,” anticipating a day when many, not just a few leaders, receive God’s empowering presence (Joel 2:28–29). Isaiah speaks of desolation ending “until the Spirit is poured upon us from on high,” linking restoration, righteousness, and peace with the coming of the Spirit (Isaiah 32:15).
• This hope is tied to the coming Davidic king who would be uniquely Spirit-endowed. Isaiah says, “the Spirit of the LORD shall rest upon him,” describing a ruler filled with wisdom, understanding, and the fear of the Lord (Isaiah 11:2). The Servant likewise speaks as one anointed by the Spirit to bring good news and justice, signaling that the messianic mission is carried forward in the Spirit’s power (Isaiah 42:1, 61:1).
• Taken together, the Old Testament shows that the Spirit proceeds from God, is poured out by God, and marks the promised Messiah’s ministry. While it does not directly address the later wording of the creed, it prepares us to see how, in the fullness of time, the Spirit’s giving will be both from the Father and intimately connected to the work and person of God’s anointed Son (Ezekiel 36:27; Isaiah 44:3).

from the new testament

• The New Testament presents the Spirit’s mission as rooted in the Father and mediated by the Son. Jesus promised, “I will ask the Father, and he will give you another Helper,” and He also said the Father would send the Spirit in His name, joining the Father’s authority to the Son’s intercession (John 14:16, 26). This places the Spirit’s coming within the loving purpose of the Father and the saving work of the Son.
• Jesus also spoke of sending the Spirit while affirming the Spirit’s origin in the Father. He said, “when the Helper comes, whom I will send to you from the Father … who proceeds from the Father,” holding together the Father as the ultimate source and the Son as the sender to the church (John 15:26). This is the core of the filioque claim: from the Father, through the Son, to the people of God.
• The risen Christ personally imparts the Spirit to His apostles as a sign and foretaste of Pentecost. He breathed on them and said, “Receive the Holy Spirit,” showing that the gift promised by the Father comes through the resurrected Son’s action (John 20:22). The Son does not replace the Father as source; He acts as the Father’s appointed mediator.
• Pentecost makes this pattern public and powerful. Peter says that Jesus is “exalted at the right hand of God, and having received from the Father the promise of the Holy Spirit, he has poured out this that you yourselves are seeing and hearing” (Acts 2:33). Paul likewise says the Spirit was “poured out on us richly through Jesus Christ our Savior,” again joining Father and Son in the Spirit’s giving (Titus 3:6).
• The apostles also name the Spirit in ways that tie Him closely to the Son. Paul speaks of the “Spirit of Christ,” and says God sends “the Spirit of his Son” into our hearts, so that the indwelling presence unites us to Christ’s life and sonship (Romans 8:9; Galatians 4:6). These titles do not deny the Father as source; they show the Son’s inseparable involvement in the Spirit’s mission.
• This biblical pattern explains the later debate: Eastern churches stress the Father as the single principle without principle. In contrast, Western churches confess the Spirit proceeding from the Father and the Son, meaning from the Father through the Son in the Spirit’s eternal relation and saving mission. The New Testament data support the Father’s primacy and the Son’s real, active sending, which the filioque seeks to summarize without dividing the one God (John 14:26, 15:26).

implications for today

Read the fine print. That’s the advice all of us learn, usually after we realize we’ve signed up for something we didn’t want. We go back to the original document, finally reading what we should have read when we signed.

When it comes to doctrine, we can also go back to the “document”---the Bible. We don’t have “fine print” but we should read it carefully. Many disagreements can be resolved by returning back to the source. This is the case with the filioque clause part of the Nicene Creed. When we get back to the text, we realize that the Holy Spirit proceeds from the Father but often through the Son. In other words, the filioque clause reinforces the Bible’s teaching on the Trinity.

Believers should consider the debate about the filioque clause a lesson in how important it is to settle confusion by going back to the primary source: God’s Word. Scripture cuts through human conjecture, and gets us back to the truth.