The authority of the apostles is that they were eye witnesses to the facts of the gospel, chosen by our Lord Jesus as the doctrinal foundations of the church. John was countering gnostic heresies that asserted a variety of false teaching. For example, some taught that Christ did not have a physical body like the normal human being. They said that sometimes when He walked on the beach, He didn't leave foot prints. Some asserted that when people went to touch Him they sometimes had their hands pass right through Him. The beloved apostle John is setting the record straight: we heard Him, we saw Him, we touched Him, etc. See how often John asserts these things just in the first chapter. As Paul put it, these things were not “done in a corner” (Acts 26:26b); meaning, that all the facts of the gospel were done out in the open witnessed by many.
I hope that helps you understand this first epistle of John.
By the way, if this is a homework question, then tell your teacher you did not use the tools that they are teaching you to use. Also ask your teacher to forgive me for aiding and abetting you.
More than just dead
2 Corinthians 5:6-8 (NASB)
6 Therefore, being always of good courage, and knowing that while we are at home in the body we are absent from the Lord—
7 for we walk by faith, not by sight—
8 we are of good courage, I say, and prefer rather to be absent from the body and to be at HOME with the Lord.
Argue with this scripture not me.
John 14:6 (NASB)
6 Jesus *said to him, "I am the way, and the truth, and the life; NO ONE comes to the Father but through Me.
John 3:16 (NASB)
16 "For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life.