>>714735756I'm speaking as someone who is Orthodox but we know God through Divine Revelation and his mysteries, through Christ becoming incarnate and prayer.
Divine revelation would not only be scripture but holy tradition in the church, Paul says the Church is the pillar and ground of truth to Timothy for example.
The mysteries would be things such as baptism and the holy eucharist which help us get closer to God.
Christ is Truth itself as he reveals a new creation that is renewed, such as defeating Satan by destroying Death when he descended into Hades. Christ also fulfills many of the promises of the Old Testament.
Praying with the heart of repentance and the need for God rather than selfishingly asking for things that aren't good also helps us get closer to God, when Christ became incarnate as the Godman, he was the greatest human to exist and yet humbly prayed to God the Father and washed the feet of the apostles, we ought to be as humble as he was.
Voices in your head or superstitions like you mentioned would most likely be demonic influence, that isn't to say that God does not ever do anything supernatural or intervene mystically but that the foundation of our faith isn't magical things happening in our lives. Rather, miracles are seen differently in Orthodoxy and does not necessarily have to be a supernatural event, being alive is considered a miracle from God for example, so is the creation of our world. If you don't like the answer and I suspect you won't like it, that is fine, I am just telling you what I believe. A lot of it is faith based but I can accept that God is beyond human comprehension, that doesn't mean belief in him is irrational.