Ephesians 2:18 shows us that our access to God involves all three Persons of the Trinity.
We have "access…to the Father."
But that access to the Father is "through him" - Yahusha Ha Mashiach, God's Son, who reconciles us to the Father (see Ephesians 2:11).
But notice further that our access to God is "in one Spirit". This means that our prayers are enabled and empowered by the Spirit.