Why God the Father and Jesus Christ don't speak audibly in this age anymore?

There is dispensation of God's communication to men and it is very explicit in the Scriptures. This means that God speaks in different ways in History. "Long ago, at many times and in many ways, God spoke to our fathers by the prophets..." Hebrews 1:1.

In the Old Testament, it was God the Father who spoke with Adam and Eve, the patriarchs, the prophets, Israel kings and other chosen men through audible voice, a burning bush, pillar of fire and cloud and through dreams and visions. Christ was not yet incarnated in the Old Testament and the Holy Spirit does not yet permanently posses the believers.

In the New Testament when Christ, God the Son was sent to the world, God the Father stopped from directly speaking to men. In fact, prior to the incarnation of His Son, he did not speak to any prophet for 400 years. And He only spoke twice in the New Testament during the baptism and the transfiguration of Jesus Christ, where in both instances, God the Father confirmed the ministry of His Son and directed men to listen to Him. These 2 instances in the New Testament where God the Father spoke audibly are Matt 3:17 and Matt 17:5. "And a voice from heaven said, "This is my Son, whom I love; with him I am well pleased" (Matt 3:17). "While he was still speaking, a bright cloud enveloped them, and a voice from the cloud said, "This is my Son, whom I love; with him I am well pleased. Listen to him!"(Matt 17:5).

Notice that God the Father directs men to listen to Christ in the New Testament because Jesus Christ was the speaker of God in the New Testament. Whatever Jesus says, God the Father says. There is no contradiction. God the Father's speaker in the NT is His Son and He doesn't need to speak audibly to anybody anymore as His Son was already speaking for Him. Hebrews 1:2 "in these last days (NT times) has spoken to us in His Son, whom He appointed heir of all things, through whom also He made the world".

But when Christ was about to die and go back to His Father in heaven, He introduced the One who will take over His ministry and that is the Holy Spirit. It means that God the Father and God the Son will never speak again AUDIBLY to any person on earth after the completion of the Canon of the Scriptures because the ministry of explaining their words has been given to the Holy Spirit. The Holy Spirit's job is to regenerate the elect, posses them, sanctify them and teach them all things that God the Father and the Lord Jesus Christ had taught during OT and NT. The Holy Spirit WILL NOT speak in audible voice to believers but explain and illumine the written words of God in the Bible to their soul. As a believer hears, reads, and meditates on God's Words, the Holy Spirit is the One explaining God's words to them.

This truth was clearly taught by the Lord Jesus Christ. He said in John 14:25-27, "All this I have spoken while still with you. But the Counselor, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you." He repeated this in John 16:13-15, "But when he, the Spirit of truth, comes, he will guide you into all truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come. 14 He will bring glory to me by taking from what is mine and making it known to you. All that belongs to the Father is mine. That is why I said the Spirit will take from what is mine and make it known to you."

Concerning prayer, don't expect God to speak directly to you when you pray because that will never happen. If it does, that someone who spoke to you is not the TRUE God because God will not contradict His own words that the Holy Spirit will be the one to illumine His written words. Prayer is intentionally lifting up to God the desires of your heart but it was never promised anywhere in the Scriptures that He will respond in an audible voice. One of the misleading definitions of prayer is that it is a 2 way communication with God. But it will never be. God will not reply to a praying believer in audible voice. The believer needs to go to the Scriptures and search God's will for his life as the Holy Spirit explains God's written words to him.

If you want God to speak to you, I suggest that you read the Bible aloud to yourself. He has already spoken and His words are available for us to know and understand through the ministry of the Holy Spirit.