God is spirit, and we are flesh and bones. Often we struggle with this difference in our daily lives. How can we believe in something we cannot see? God knows us. He created us from the dust into flesh and bones, then He breathed life into us by His spirit (Genesis 2:7). It is by our God breathed spirit that we know God. God in His infinite knowledge of us, gave us His word in the physical sense. He knows the trials and tribulations of this life, and provided us with His word to live by. One might ask, how can this be so?
God gave us His only son, and His words were the words of God (John 1:14). Those words, and their circumstance, were recorded by the writers of the books of Matthew, Mark, and Luke. The three writers corroborate the life of Jesus, along with the book of John from their own perspective. According to the words of Jesus, every word of the Hebrew scripture is true (Matthew 5:18). This scripture is contained in the old testament of the Christian bible.

The book of Acts is a continuation of the life of Jesus after His resurrection. In the book of Acts, Jesus introduces His disciples to the Holy Spirit which will make the disciples witnesses of Jesus (Acts 1:8). The disciples were filled with the Holy Spirit and spoke the word of God with boldness (Acts 4:31). The remainder of the new testament is composed of letters written by those disciples who were filled with the Holy Spirit and spoke the word of God with Boldness. The Apostle Paul authored a good many of those letters. In his letter to the Galatian Church, the Apostle Paul said: "But I certify you, brethren, that the gospel which was preached of me is not after man. For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ." (Galatians 1:11-12). The final book of the Bible, called Revelations, was a letter from the Apostle John to the church. In the book of revelation John shares the words which Jesus showed him by the spirit (Revelation 21:5).