The Bible we have today was written over 1000 years, using 40 different authors, in three languages and is arranged in 66 books. It is inspired by God. God inspired these men to write what they did because the internal evidence is overwhelming that the inspiration came...
2 Timothy 3:16 KJV
"All scripture is given by inspiration of God..."
Ephesians 3:9 KJV
"And to make all men see what is the fellowship of the mystery..."
1Timothy 2:5 KJV
"For there is one God, and one mediator between God and men, the man Christ Jesus;"
1Timothy 2:5 KJV "For there is one God, and one mediator between God and men, the man Christ Jesus;". Before the foundation of the world, the God-Head existed as God, Christ and the Holy Spirit.
And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers;"
Miracles in the Post Acts period are not in affect because that ended due to the final judgement against Israel when they became "Lo-Ammi" to God, which means "not my people".
Hebrews 8:8 KJV
"...Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:"