Two things. The point I was making is that Luke admitted that he was not writing his account of Jesus because he was inspired by the Holy Spirit to do so. He admitted that he did it because he thought he was more capable than those who did before. This also showed that he thought they did so on their own too and not because they were inspired by the Holy Spirit to do so.
First, lets address the "Holy Spirit" before we go any further to get an understand of it purpose. In a nutshell Holy spirit is a teacher of rightness one who enable us with understanding of all things, things that we need to know.
Sorry about be so length but the point is to get a clear understand of the Holy Spirit. Jesus said He would send the Spirit to us to be our Helper, Comforter, and Guide. “And I will ask the Father, and he will give you another Counselor to be with you forever” (John 14:16). The Greek word translated here “Counselor” means “one who is called alongside” and has the idea of someone who encourages and exhorts. The Holy Spirit takes up permanent residence in the hearts of believers (Romans 8:9; 1 Corinthians 6:19-20, 12:13). Jesus gave the Spirit as a “compensation” for His absence, to perform the functions toward us which He would have done if He had remained personally with us.
The Spirit’s presence within us enables us to understand and interpret God’s Word. Jesus told His disciples that “when He, the Spirit of Truth, comes, He will guide you into all truth” (John 16:13). He reveals to our minds the whole counsel of God as it relates to worship, doctrine, and Christian living. He is the ultimate guide, going before, leading the way, removing obstructions, opening the understanding, and making all things plain and clear. He leads in the way we should go in all spiritual things. Without such a guide, we would be apt to fall into error. A crucial part of the truth He reveals is that Jesus is who He said He is (John 15:26; 1 Corinthians 12:3).
Now lets look at the verse in question.
"It seemed good to me also, having had perfect understanding of all things from the very first, to write unto thee in order, most excellent Theophilus,"
Luke is writing what he experience and know about Jesus. His experience like the ones before him such as, Matthew, Mark, and John just to name a few, was lead by the holy spirt which bring all those things into remembrance to write about. Notice the "also" in the verse you seem so fixated about, when there is an "also" we need to look and see what was stated before. Lets examine the verses before Luke 1:3.
"Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us,
Even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word;"
Among Us, disciples of Jesus (Matthew, Mark, John, Luke, Peter, James, etc.)
In the verses above Luke is saying many before him being eyewitnesses have given their written account about the life of Jesus. Hence his statement below.
"It seemed good to me also, having had perfect understanding of all things from the very first, to write......"
Here Luke is saying he also will give his account of the things he witness.
Secondly, there goes your condescending attitude again suggesting that unlike you, I don't have a job I get paid to do. For your information, I get paid to be a Financial Controller. I don't know how you feel about that job but I do see it as a responsible one.
I apologize my comment was not meant to be condescending. I thought you mention somewhere before about being self employed hence my statement. I'm an IT Security Engineer and yes I do understand how responsible our jobs can be.