I personally believe Jesus had Peter deny him to illustrate to us just how much man needs the indwelling of the Holy Spirit. Before Peter and the disciples were given the Holy Spirit they had no ability to withstand Satan. Satan was able to manipulate man at will. The disciples did not receive the Holy Spirit until Pentecost, which was after Jesus ascended into Heaven.
The Apostles denied Jesus, a GRIEVOUS sin. Jesus taught them personally for years. They knew who He was. You are evading the point.
A Spiritual person is one who has the Holy Spirit and has allowed the Holy Spirit to control his or her lives.
How do you know someone has the Holy Spirit? How do you know you have the Holy Spirit? Can you prove it?
I have not willfully committed a sin in over thirty years. That only means that God has made a home in me and he has kept me safe from Satan/sin. Before God made a home in me I was not able to withstand Satan/sin.
So then, for "over thirty years" you haven't had an evil thought, or said anything you regret in person or on the internet?
A person who is in christ doesnt have to sin, you are no longer a slave to sin... It is very possible to go through life without sinning, before every action... u have a thought, u have a choice: Would god approve of this or not, if you live your life in that manner then your are good, the spirit always wants to please the father, but its OUR FLESH thats is trying to compete with it. You notice how after Jesus heals someone, he says go and sin no more, lest something worse happens to you. GO AND SIN NO MORE, he meant that. Dont sin. I hate when people say, "we're human, we're gonna sin...." Thats an excuse to go out and do something contrary to what jesus says... YOU DONT HAVE TO SIN. You have the choice. Now sinning doesnt necessarily mean your damned, but think about it, temptation is meant to destroy you, not to just get you off track, but to kill you. God says the wages of sin is death. So everytime you sin, something dies. Remember that... Just dont do it.
Have you sinned "willfully" since you became a Christian? T1 says that those who have sinned willfully are children of Satan.